高考英语单选分类训练：连词（含解析）
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单项选择
1．Posts should not give out personal information,________they should not include ads.
A．but B．so C．or D．and
2．According to the study’s lead author, the finding is________ there isn’t just one single health-related consequence of consuming coffee, ________that the reality is more complicated than that.
A．/, in B．that, / C．/, provided D．that, but
3．Addicted to shopping, I found that the items I bought lost their appeal right around ________ a new item caught my eye.
A．the second when B．a second when C．the second D．a second
4．________ I am willing to help you, I do not have much time available.
A．Since B．For that C．While D．When
5．A digital ring is locked on every newborn baby’s foot ________ they are taken by strangers out of the hospital.
A．Now that B．even if C．so that D．in case
6．_______ we’ll go hiking tomorrow depends on the weather.
A．If B．Whether C．That D．Why
7．In my opinion, the topic is too difficult to understand. Try to simplify your speech ______ it goes beyond the children.
A．even if B．as if C．in fact D．in case
8．We cannot accept a society _____ the rich enjoy comfort _____ the poor have to suffer.
A．which; while B．where; while C．that; which D．where; that
9．Which one of the following sentences is grammatically incorrect
A．The girl imagined her future college life to be challenging yet enlightening.
B．He is surprised to find that the man should be alive after being buried for hours.
C．With many problems to deal with, he went back to the office and started working.
D．There was no soup served for lunch or there was no vegetable served for dinner.
10．Demand for solar panels has shot up to unprecedented levels in Spain ___________ Europe’s energy crisis shows no sign of letting up, in a welcome boost for a sector with huge potential.
A．but B．though C．as D．while
11．________ Chinese ________ Japanese are Asians.
A．Both；and B．Neither；nor C．Neither；or D．Either；or
12．The family members were discussing where to take a trip during the winter vacation ________a tourist agent turned up at the house.
A．when B．while C．even if D．though
13．The shepherd and his dog set out early in the morning ________they could drive the flock of sheep to the valley before the noon.
A．because B．before C．so that D．while
14．We will suffer from the hazy weather more often than before ________ our air is being seriously polluted.
A．because B．unless C．until D．although
15．________ her disappointment, she ________ and managed a bright smile.
A．Though; moved on B．In spite of; took off C．As; settled down D．Despite; cheered up
16．________ I can remember, this is the third time we’ve met.
A．As soon as B．As long as C．As much as D．As far as
17．________ other companies still kept integrating fingerprint readers, Apple threw that out and made facial recognition work.
A．Once B．While C．Unless D．Since
18．-Shall we go out for a walk
-I'm afraid not. We can't go out________our work is being done.
A．before B．until C．as ` D．after
19．It’s more than half a century ________ my grandfather joined the Party and became a servant to the people.
A．when B．that C．since D．as
20．________you master an effective method to study French ________ make great progress in a short time.
A．Only if; will you B．Only if; you will
C．Unless; will you D．Unless; you will
21．Autumn is here. ________ time goes on,it's getting colder and colder.
A．As B．With C．Because D．Since
22．When a new movement in art contributes to a certain fashion, it is advisable to find out what its advocates are aiming at, for ________ unreasonable their principles may seem today, it is possible that in years to come they may be regarded as normal.
A．what B．however C．though D．which
23．He was so busy. He cannot afford enough time with his son ________ he really wants to.
A．as if B．even if C．in case D．before long
24．The farmer watered the vegetables in the field________they might grow better.
A．in case B．for fear that C．now that D．so that
25．Your parents won't be satisfied with you ________you pass the final examination.
A．until B．if C．unless D．otherwise
26．The last time we met each other was_________I was on a business trip in Beijing.
A．when B．how C．where D．why
27．It’s not surprising ________ you won the medal, considering how much you paid for it.
A．whether B．why C．because D．that
28．Mrs. Smith was cooking breakfast in the kitchen ________ she heard a loud knock at the door.
A．before B．since C．when D．while
29．Which one of the following sentences is the compound sentence(并列句)
A．Playing football and dancing are his favourites.
B．The good news is that this stormy period will not last.
C．You feel ready to be more responsible and make decisions on your own.
D．I don’t know what “home” is, but unhappiness and worries melt away once there.
30．The young man tried to stop, ________he drove too fast to stop.
A．and B．but C．so D．or
31．Her performance was perfect and, ________ the fact that there were other 20 participants, the first prize still belonged to her.
A．however B．while C．though D．despite
32．________ she welcomes the new enterpreneurial spirit, she advises that people be realistic and seek guidance________ rushing into things.
A．Since, when B．As, before
C．Though, before D．Although, when
33．________ tested positive for novel coronavirus, anyone living in China will receive free medical treatment from our government.
A．Until B．Unless C．Once D．Although
34．The old couple loves the boy ________ he were their own son.
A．even if B．unless C．as if D．though
35．We won’t get good grades in P. E ________ we keep exercising every day.
A．if B．because C．unless D．since
36．________there was no solid evidence, most people thought he was guilty.
A．Because B．While C．As D．Unless
37．We’ve missed the bus. It looks _________ we’ll have to walk home.
A．ever since B．as long as C．even though D．as though
38．________ focusing on what you lack, try noticing what you have. You may gradually feel better.
A．More than B．Other than C．Rather than D．Less than
39．Our English teacher is nice and patient ________ she is very strict with us.
A．if B．as C．although
40．Emily, you are playing video games again! Study hard, ________ you will fail in the coming exam.
A．then B．so C．and D．or
41．He insisted that he saw a UFO, ________ he couldn’t provide any solid evidence.
A．while B．otherwise C．yet D．however
42．There is no doubt ________ man will continue to explore the vast universe in the future，but the rate at which we approach depends on the development of technology.
A．whether B．what C．when D．that
43．—I don't know ________ to do with this maths problem. It's too hard.
—You can ask your classmates or teachers for help.
A．which B．how C．what D．when
44．Mexican and Tex-Mex foods were popular in the USA, ________ now Chinese food has more fans.
A．because B．but C．so D．unless
45．I was about to watch a football match ________ my mother called me to buy drinks.
A．while B．as C．when D．until
46．Chinese overseas students are encouraged to return, ________ they honestly fill out medical forms and strictly follow the quarantine（隔离期）rules.
A．though B．as long as C．unless D．as if
47．He made a serious mistake. But he took action to change that ________ it got worse.
A．until B．unless C．when D．before
48．Mr. Black walked around and offered help________ we were doing an experiment.
A．while B．although C．until D．unless
49．It is still not known if he succeeded in reaching the top of Qomolangma________ it took his life.
A．after B．before C．until D．since
50．Sue likes going to the shops and always spends money ______ there was no tomorrow.
A．even if B．as if C．as long as D．as soon as
51．_____, there seemed little hope that the adventurer would find his way through the vast rainforest.
A．Confused by the map
B．As he had been confused by the map
C．Having been confused by the map
D．He had been confused by the map
52．You can use a timer to count down to 15 minutes you won't need to constantly look at the clock to see how much time has gone.
A．even though B．now that C．in case D．so that
53．Tom was about to close the window__________his attention was caught by a bird.
A．when B．till C．while D．as
54．—Some Chinese students find it difficult to understand native speakers when in London.
—Exactly, _________ they’ve learned a lot about grammar and known many words.
A．if only B．now that C．as if D．even if
55．You will never achieve success _______ you keep working hard.
A．when B．if C．unless D．because
56．I was glad to meet Lydia again, _______ I didn't want to spend all day with her.
A．but B．and C．or D．so
57．______ I saw my father ,I burst into tears.
A．The instant B．both A and D C．At the instant D．Instantly
58．Take a taxi, you'll miss your train.
A．and B．if C．otherwise D．but
59． the outbreak of COVID-19 is a terrible blow to the country, the government is trying hard to bring the situation under control.
A．Although B．If C．Unless D．Because
60．Lose one hour in the morning ________ you will be looking for it the rest of the day.
A．but B．and C．or D．so
61．Pick yourself up. Courage is doing _______ you are afraid to do.
A．whether B．which C．how D．what
62．Ms. Ji had been thinking about what to cook for lunch the whole morning ________ all at once an authentic recipe for stewed eggplants ________ her on her drive home.
A．when; stuck B．while; struck C．when; struck D．while; stuck
63．Learning a foreign language is not easy， and it comes to speaking， it can be more difficult．
A．when B．unless C．once D．while
64．﹣﹣English is becoming so important．
﹣﹣It's true．Many university classes are taught in English ______ the native language is not English．
A．as if B．what if
C．as long as D．even though
65．_______ something unexpected happens, I'll see you tomorrow at school．
A．Before B．Unless C．Although D．Because
66．There is an illness that can result in total blindness ______ left untreated.
A．after B．if C．since D．unless
67．He always had his camera ready whenever he traveled, just he saw something that would make a good picture.
A．in case B．so that C．for fear that D．as if
68．_______ online shopping has changed our life, not all of its effects have been positive.
A．While B．Because C．If D．Once
69．I like the city, but I like the country better I have more friends there.
A．in which B．for which C．in that D．at that
70．The little girl won’t go to sleep at noon _______ her mother tells her a story.
A．or B．but C．if D．unless
参考答案：
1．D
【详解】考查并列连词。句意：帖子不应该透露个人信息，也不应该包含广告。A. but但是、而，表示转折关系；B. so因此、所以，表示因果关系；C. or或者、否则，表示选择关系；D. and和、并，表示并列关系。设空处前后两个句子均有should not，此处表示“不应该……也不应该……”，为并列关系，应用and。故选D项。
2．D
【详解】考查表语从句和连词。句意：根据该研究的主要作者的说法，这一发现表明，喝咖啡不仅会带来一个与健康相关的后果，而且现实情况比这更复杂。根据前文the finding is可知，空1处应用that引导表语从句，一般不省略；空2处可用并列连词but连接另一个表语从句。故选D项。
3．C
【详解】考查连词。句意：沉迷于购物的我发现，我买的东西一旦被新东西吸引，就会失去吸引力。分析句子结构可知，句中缺少连词，所以用连词短语the second，表示“一……就……”，引导时间状语从句。故选C。
4．C
【详解】考查从属连词辨析。句意：尽管我很愿意帮助你，但是我没有太多可用的时间。A. Since因为；B. For that因为；C. While虽然，尽管；D. When当……的时候。分析句子可知，“I am willing to help you”和“I do not have much time available”之间存在转折关系，空处应用while来连接两个句子，表示让步转折。故选C。
5．D
【详解】考查连接词词义辨析。句意：每个新生儿的脚上都锁着一个数字戒指，以防被陌生人带出医院。A. Now that既然；B. even if即使；C. so that因此；D. in case以防。根据句意可知，空后是前文做法的目的，应用“以防”引导目的状语从句。故选D项。
6．B
【详解】考查主语从句。句意： 明天我们是否去远足取决于天气。A. if是否；如果；B. Whether是否；C. That引导宾语从句，仅起引导作用，无词义；D. Why为什么。分析句子可知，空处引导主语从句，表示“是否”，if引导主语从句不能置于句首，故选B。
7．D
【详解】考查连词和固定短语辨析。句意：在我看来，这个话题太难理解了。尽量简化你的演讲，以免超出孩子们的理解范围。A. even if即使；B. as if似乎；C. in fact实际上；D. in case以免。由语意可知，这个话题太难理解了，因此才建议要简化演讲，以免孩子听不懂。D选项符合题意。故选D项。
8．B
【详解】考查定语从句和并列句。句意：我们不能接受一个富人享受舒适而穷人受苦的社会。分析句子可知，该句第一空引导的定语从句，先行词a society在从句中作地点状语成分，应用关系副词where；该句第二空为连词while连接的两个简单句，the rich enjoy comfort和the poor have to suffer是对比，while表示对比关系时，意思是“而，然而”。故选B项。
9．D
【详解】考查连词。题干问下面哪个句子在语法上是不正确的，A. The girl imagined her future college life to be challenging yet enlightening. 女孩想象着她未来的大学生活充满挑战，但也很有启发性.imagine something to be“想象” ，yet表示但是；B. He is surprised to find that the man should be alive after being buried for hours. 他惊讶地发现那个人被埋了几个小时后竟然还活着。形容词后用不定式，find后是宾语从句，介词后用动名词的被动形式；C. With many problems to deal with, he went back to the office and started working. There was no soup served for lunch or there was no vegetable served for dinner.由于有许多问题要处理，他回到办公室开始工作。with+宾语+动词不定式表示将来。D. There was no soup served for lunch or there was no vegetable served for dinner.午餐没有汤，晚餐也没有蔬菜。 D选项应该是并列句用and连接，不用or，故选D。
10．C
【详解】考查从属/并列连词。句意：由于欧洲的能源危机没有减弱的迹象，西班牙对太阳能电池板的需求已飙升至前所未有的水平，这对一个具有巨大潜力的行业来说是一个可喜的推动力。A. but但是；B. though尽管，虽然；C. as因为；D. while而。结合句意可知，空后表示原因，应用as引导原因状语从句，故选C。
11．A
【详解】考查连词。句意：中国人和日本人都是亚洲人。主语由both...and...接时，谓语动词用复数形式；由并列结构either...or....，neither...nor...接的并列主语，谓语动词与靠近的那个名词或代词的单复数保持一致。故选A。
12．A
【详解】考查连接词词义辨析。句意：一家人正在讨论寒假去哪里旅行，这时一个旅游代理人出现了。A. when在……时候；B. while与……同时；C. even if即使；D. though虽然。be doing sth. when...为固定句型，表示“正在做某事，这时……”，结合句意，该句适用该句型。故选A项。
13．C
【详解】考查连词。句意：牧羊人和他的狗一大早就出发了，这样他们就能在中午之前把羊群赶到山谷里。A. because因为；B. before在……以前；C. so that为了，以便；D. while 当……的时候。根据句意可知，“在中午之前把羊群赶到山谷里”是“牧羊人和他的狗一大早就出发”的目的，所以用连词so that 引导目的状语从句。故选C项。
14．A
【详解】考查连词。句意：我们将遭受雾霾天气比以前更频繁，因为我们的空气正受到严重污染。A.because因为；B.unless除非；C.until直到；D.although虽然。分析此句可知，上下句为因果关系，故选A。
15．D
【详解】考查介词/连词和动词短语词义辨析。尽管失望，她还是振作起来，露出灿烂的笑容。though/as尽管，应当让步性状语从句，后接句子；despite/in spite of尽管，后接名词或动名词作宾语；moved on继续；took off起飞；settled down定居；cheered up振作起来。结合结构和句意，her disappointment为名词，第一空格用despite/in spite of； 空格二为“振作起来”，用动词短语cheered up。故选D项。
16．D
【详解】考查连接词词义辨析。句意：就我能记得的而言，这是我们第三次见面。A. As soon as一……就……；B. As long as只要；C. As much as与……一样多；D. As far as就……而言。根据句意，空处应用as far as引导状语从句，表示“就……而言”。故选D项。
17．B
【详解】考查连词词义辨析。句意：当其他公司还在继续整合指纹识别器时，苹果放弃了这一做法，并启用了面部识别功能。A.Once 一......就；B.While当......时候；C. Unless除非；D. Since自从。根据句意可知，本句为while引导的时间状语从句。故选B项。
【点睛】
18．C
【详解】考查连词词义辨析。句意：——我们出去散散步好吗？——恐怕不行。我们不能出去，因为我们的工作正在进行中。A. before在……之前；B. until直到……为止；C. as因为；D. after在……之后。根据“our work is being done”可知，这是我们不能出去散步的原因。故选C。
19．C
【详解】考查连词。句意：我祖父入党为人民服务已经有半个多世纪了。A.when当......的时候；B.that那个； C.since自从；D.as因为。由后面的“my grandfather joined the Party”和前面的“It’s more than half a century”可知，句子表示“自从我祖父入党为人民服务以来已经有半个多世纪了”，因此空格处是“自从”，即since，故选C。
20．A
【详解】考查连词词义辨析和倒装句。句意：只有掌握了一种有效的法语学习方法，你才会在短时间内取得很大进步。 only if“只有”，unless“除非”，根据句意，空格一用only if引导条件状语从句，置于句首，主句用部分倒装，助动词will置于主语之前，根据“主将从现”原则，主句用一般将来时，综上，故选A。
21．A
【详解】考查连词。句意：秋天来了。随着时间的流逝，天气变得越来越冷了。A. as 随着；B. with 介词“有”； C. because 因为； D. 因为，既然,自从；分析句子结构可知空格所在句子为时间状语从句可知，表示“随着”，故选A项。
22．B
【详解】考查从属连词词义辨析。句意： 当一场新的艺术运动形成某种时尚时，理应弄清其倡导者的目标所在，因为无论他们的准则在今天看来是多么不可思议，将来都有可能被视为正常的。what什么；however 不管怎样；无论；though尽管；which哪一个。for引导的状语从句中包含一个让步状语从句，根据句意，修饰形容词unreasonable用副词however，表示“无论多么不可思议”，故选B。
23．B
【详解】考查连词词义辨析。句意：他太忙了，没有足够的时间陪他的儿子，即使他真的想（陪儿子）。A. as if好像；B. even if即使；C. in case万一；D. before long不久以后。根据句意，这里表示“他没有足够的时间陪他的儿子，即使他真的想（陪儿子）”，前后是让步关系，故选B。
24．D
【详解】考查连词。句意：那位农民在农田里给蔬菜浇水，目的是为了让这些菜能长得更好。A. in case万一；B. for fear that唯恐；C. now that既然；D. so that为了。根据句意可知，农民在农田里给蔬菜浇水的目的就是为了让这些菜能长得更好。故选D项。
25．C
【详解】考查连词词义辨析。句意：除非你期末考试及格，否则你父母不会对你满意的。A. until直到……才；B. if如果；C. unless除非；D. otherwise否则。根据句意，可知这里表示“除非你期末考试及格”，故选C。
26．A
【详解】考查从属连词。句意：我们最后一次见面是在我去北京出差的时候。A:when何时; B:how如何；C:where哪里；D:why为什么。此处为表语从句，从剧中缺少时间状语，故答案为A。
27．D
【详解】考查连词。句意：考虑到你的付出，你赢得这个奖牌一点也不令人吃惊。根据句子结构可知，“It”是形式主语，真正的主语是“______you won the medal”，所以空处引导主语从句。分析从句的句子结构和主从句的上下文意思可知，此空不做任何句子成分，不需要任何意思，只需要起到连接主从句的作用，符合连词“that”在主语从句中的用法。故选D项。
28．C
【详解】考查连词辨析。句意：史密斯太太正在厨房里做早餐，突然听到有人大声敲门。A.before在......之前； B. since自从；C. when正在那时；D.while尽管。be doing sth when...“正在做某事，正在那时......”。故选C项。
29．D
【详解】考查并列句。A项句意：踢足球和跳舞是他的最爱。B项句意：好消息是，这一风暴期不会持续。C项句意：你觉得自己已经准备好承担更多的责任，自己做决定。D项句意：我不知道“家”是什么，但不快乐和忧虑一旦到了那里就消失了。分析句子结构可知，AC项为并列结构，B项为表语从句，只有D项是由并列连词but所并列的句子，即并列句。故选D。
30．B
【详解】考查连词。句意：那个年轻人尽力停车，但他开得太快了以至于停不下来。A. and并且；B. but但是；C. so因此；D. or或者。分析前后两句，可知表示转折关系，用but。故选B。
31．D
【详解】考查连词。句意：她的表演非常完美，尽管还有其他20名参赛者，但一等奖仍然属于她。A.however然而；B.while尽管；C.though尽管；D.despite尽管。分析句子结构，前面有连词and，可知Her performance was perfect和后句the first prize still belonged to her是并列关系，the fact that there were other 20 participants是that引导的同位语从句，此句相当于一个the fact名词，而选项however一般后面有逗号隔开，作连接副词，后面接句子；while作连词，后面接句子；though作连词，后面接句子；despite作介词，后面接名词。故选D项。
32．C
【详解】考查让步状语从句和介词。句意：尽管她欣然接受企业家精神，她建议人们在匆忙投身某事之前应该基于现实并且寻求指导。根据句意可知，第一空引导让步状语从句，可用though或although 引导，as引导让步状语从句时，必须倒装；第二空意为“在……之前”，应用介词before。故选C项。
33．C
【详解】考查从属连词。句意：一旦新型冠状病毒检测呈阳性，所有在中国生活的人都将享受我国政府提供的免费医疗。A. Until直到；B. Unless除非；C. Once一旦；D. Although虽然。根据“anyone living in China will receive free medical treatment from our government.”可知此处表示“一旦”。故选C。
34．C
【详解】考查从属连词和虚拟语气。句意：这对老夫妇爱这个男孩，就好像他是他们自己的儿子一样。A. even if即使；B. unless除非；C. as if好像；D. though虽然，尽管。分析句子可知，句子为状语从句，从句部分为虚拟语气，再结合句意可知，空格处应用“as if”引导从句，意为“好像”，从句谓语动词动作与主句谓语动词动作同时发生，从句要用一般过去时，“be”动词要用“were”。故选C项。
35．C
【详解】考查连词词义辨析。句意：如果我们不能每天坚持锻炼，我们就不会在体育上取得好成绩。A. if如果；B. because因为；C. unless除非，如果不；D. since既然。根据句意可知，后文“we keep exercising every day”是前文的条件（否定），unless= if ... not， 故用unless引导条件状语从句，符合句意。故选C项。
36．B
【详解】考查连词。句意：尽管没有确凿的证据，但大多数人认为他有罪。A.because因为；B.while尽管；虽然；C.as因为；D.unless除非。前半句表示没有确凿证据，后半句表示人们认为他有罪，前后是转折关系，故选B。
37．D
【详解】考查连词短语词义辨析。句意：我们错过了公共汽车。看来我们好像得走着回家了。A. ever since自从那时起；B. as long as只要；C. even though即使；D. as though仿佛；好像。根据“We’ve missed the bus.”可知，因为没有公共汽车，所以好像要走着回家了。故选D。
38．C
【详解】考查短语词义辨析。句意：与其关注你所缺乏的，不如试着关注你所拥有的。你可能会逐渐感觉好些。A. More than不仅仅；B. Other than除了；C. Rather than与其……倒不如；D. Less than少于。根据“try noticing what you have.”可知，此处是指不要只关注你所缺乏的。故选C。
39．C
【详解】考查连词词义辨析。句意：虽然我们的英语老师对我们很严格，但她很和蔼，很有耐心。A. if如果；B. as因为；C. although虽然；尽管。根据前后句意可知，前后句为转折关系，所以用连词although。故选C。
40．D
【详解】考查连词词义辨析。句意：艾米丽，你又在玩电子游戏了！努力学习吧，否则你在接下来的考试中会不及格的。A. then然后，表顺承；B. so所以，表结果；C. and和，表并列；D. or否则，表条件。本句是“祈使句+or+陈述句”固定句型，表示在以祈使句为条件下的相反假设，意为“否则,要不然”。根据句意结构和语境，故选D。
41．C
【详解】考查并列连词。句意：他坚持称看到了外星人，但是他无法提供确凿的证据。根据句意可知“看到外星人”和“没有证据”造成了转折。故用转折连词yet，意为“然而、但是”符合题意。故选C项。
42．D
【详解】考查同位语从句。句意：毫无疑问，人类将在未来继续探索广阔的宇宙，但我们接近的速度取决于技术的发展。分析句子可知，空格后是同位语从句，解释说明doubt，从句句意完整，成分齐全，that引导同位语从句，无词义，不作成分，仅起引导作用，符合题意，故选D。
43．C
【详解】考查连接词。句意：——我不知道如何处理这道数学题。太难了。——你可以向你的同学或老师求助。此处是“连接词+动词不定式”作 don't know的宾语，由此处要作do的宾语，表示“什么”，可知要用what，what to do with“如何处理”。故选C项。
44．B
【详解】考查连词词义辨析。句意：墨西哥和德州-墨西哥食物曾在美国很受欢迎，但现在中国食物有更多的粉丝。A. because因为；B. but 但是；C. so所以；D. unless除非。上文提到墨西哥和德州-墨西哥食物曾在美国很受欢迎，后文说现在中国食物有更多的粉丝，前后为转折关系，应用连词but。故选B。
45．C
【详解】考查连词。句意：我正要去看足球比赛，这时我妈妈打电话叫我去买饮料。A.while在...期间，在...的过程中,（对比两件事物）而，虽然；B.as因为，在...时，随着；C.when在...时候，在...之后；D.until直到...为止。固定句式be about to do...when...“正要做某事...这时...”。故选C项。
46．B
【详解】考查连词词义辨析。句意：中国留学生被鼓励回国，只要他们诚实地填写医疗表格，严格遵守检疫规则。A. though尽管；B. as long as只要；C. unless除非；D. the moment一……就……。后文是条件状语，根据句意，故选B。
47．D
【详解】考查连接词词义辨析。句意：他犯了一个严重的错误。但他在情况恶化之前采取行动改变了这一点。A. until直到；B. unless除非；C. when当……的时候；D. before在……之前。根据He made a serious mistake. But推测后句句意：在变得更糟之前采取行动改变。故选D。
48．A
【详解】考查从属连词。句意：当我们做实验时，布莱克先生四处走动并提供帮助。A. while当……时；B. although虽然；C. until直到；D. unless如果不，除非。根据主句“Mr. Black walked around and offered help（布莱克先生四处走动并提供帮助）”和从句“we were doing an experiment（我们正在做实验）”可知，此处使用连词while“当……时”引导时间状语从句。故选A。
49．B
【详解】考查连接词词义辨析。句意：目前还不清楚他是否在丢掉性命之前成功登上珠穆朗玛峰峰顶。A. after 在……之后；B. before 在……之前；C. until 直到……；D. since 自从……以来。根据句意，此处表示他在珠穆朗玛峰上丢掉性命之前，是否登上了珠穆朗玛峰峰顶，现在还不知道。故选B。
50．B
【详解】考查连词辨析。句意：苏喜欢去商店买东西，总是像没有明天一样花钱。A.even if即使；B.as if好像；C.as long as只要；D.as soon as一......就......。从句使用的是虚拟语气，结合句意可知，此处用as if引导状语从句复合语境。故选B。
51．B
【详解】考查连词。句意：由于这张地图把他弄糊涂了，这位冒险家找到穿越这片广袤雨林的路的希望似乎不大。分析句子结构可知，第二句和第一句的主语不一致，所以前一句不能使用非谓语动词，两句之间存在因果关系，需要用连词as连接，故选B项。
52．D
【详解】考查状语从句。句意：你可以用计时器倒计时到15分钟，这样你就不用经常看钟来知道已经过去了多少时间了。A. even though即使；B. now that既然；C. in case以防万一；D. so that因此。分析句意可知，“You can use a timer to count down to 15 minutes”的目的是“you won't need to constantly look at the clock to see how much time has gone”，可知，句子是so that引导的目的状语从句。故选D项。
53．A
【详解】考查固定句式。句意：汤姆正要关窗户时，一只鸟引起了他的注意。固定句式be about to do sth. when …正要做某事的时候，这时某事发生了。故选A。
54．D
【详解】考查连词短语辨析。句意：——一些中国学生发现在伦敦时，理解当地人很困难。——确实是。即使他们已经学了许多语法，知道了许多单词。A.if only只要；B.now that既然；C.as if好像；D.even if即使。根据后面的exactly，“确实”，可知，后者同意前者所讲，“许多中国学生确实理解不了当地人”，因此和后面“他们学了许多语法和单词”是让步关系。故选D。
【点睛】
55．C
【详解】考查连词词义辨析。句意：除非你继续努力，否则你永远不会成功。A. when当……时候；B. if如果；C. unless除非；D. because因为。unless是从属连词，引导条件状语从句，含有否定意义，相当于if条件状语从句的否定形式，所以unless= if not。根据句意，unless符合题意，故选C。
56．A
【详解】考查连词。句意：我很高兴再次见到Lydia，但是我不想全天一直和她在一起。A. but但是；B. and和；C. or或者；D. so因此。根据句意可知，虽然再次见到Lydia很开心，但是不想一直陪着她，but表示转折，符合语境。故选A项。
57．B
【详解】考查连词。句意：我一看见我父亲，我就哭了。分析句子结构可知，设空处引导时间状语从句；再根据所给选项，A项the instant和D项instantly为连词，意为“一...（就）”，符合语境，所以两个选项都可以。故选B。
【点睛】
58．C
【详解】考查连词辨析。句意：打车吧，否则你会错过火车的。A.and并且；B.if如果；C.otherwise否则；D.but但是。说话者让对方打车，如果不这样的话就会错过火车。所以表达的意思为“否则”。故选C。
59．A
【详解】考查连词。句意:虽然新型冠状病毒肺炎的暴发对全国是非常严重的打击，但是政府正尽力掌控局势。A. although虽然；B. if如果；C. unless除非；D. because因为。根据句意可知，前后句为转折关系，设空处引导让步状语从句，意为“虽然”。故选A项。
60．B
【详解】考查连词词义辨析。句意：在早上失去的一个小时，你需要花费一天时间去弥补。A. but 但是；B. and而且；C. or 或者；D.so因此。结合后文“you will be looking for it the rest of the day”以及空前是以lose动词原形开头是祈使句，可知，此处是“祈使句+and+简单句”结构，前后文为并列关系。故选B。
61．D
【详解】考查从属连词辨析。句意：振作起来，勇气就是做你害怕做的事。A. whether是否；B. which 哪一个；C. how怎样；D. what什么。根据句意及句子结构可知，Courage is doing后跟宾语从句，而宾语从句中缺少宾语，且意为“......的事情”，应用连接代词what。故选D项。
62．C
【详解】考查连词和动词辨析。句意：整个上午，纪女士都在考虑午餐做什么，在开车回家的路上，她突然想到了一道正宗的炖茄子食谱。主句动作是延续性动词，从句动作是非延续性动词，要用when引导从句而不能用while。stuck是stick的过去式，表示“刺，伸出，粘住”，struck是 strike的过去式，表示“突然想到”，此处表示突然想到了一个食谱，用struck。故选C。
63．A
【详解】考查从属连词和固定句型。句意：学习一门外语并不容易，当谈到口语时，可能会更困难．A．when当…时候；B．unless除非；C．once一旦；D．while当…时候，虽然。根据句意可知，这里使用固定搭配when it comes to “当说到……的时候”。故选A。
64．D
【详解】考查从属连词。句意：——英语正变得如此重要。——真的如此，很多大学课程用英语教学，即使他们的母语不是英语。A.as if 好像；B.what if如果…会怎样；C. as long as只要；D even though即使。根据"Many university classes are taught in English"（很多大学课程用英语教学）和"the native language is not English"（他们的母语不是英语）可知两句之间是让步关系，所以答案是D。
65．B
【详解】考查从属连词辨析。句意：除非有意料之外（没有提前想到）的事情发生，否则我明天将会去学校见你。A. before在…之前；B. unless除非；C. although虽然；D. because因为。根据句意和各个选项的含义可知，这里用unless引导条件状语从句，表示日程安排的例外情况（除非有意外情况），故选B。
66．B
【详解】考查从属连词和状语从句中的省略。句意：有一种疾病如果不治疗就会导致完全失明。A. after 在……之后;B.if 如果；C.since自从；D.unless除非。根据句意可知，“不治疗”是“导致完全失明”的条件，故用if来引导条件状语从句，符合句意；从句主语与主句主语一致，且从句谓语中包含be动词，所以省略了从句的主语和be动词，还原后为“if it is left untreated”。故选B项。
67．A
【详解】考查连词。句意：每次旅行时，他总是把相机准备好，以防看到能拍出好照片的东西。A. in case万一； B. so that以便； C. for fear that唯恐；D. as if好像。前面的“他总是把相机准备好”跟后面的“看到能拍出好照片的东西”是假设条件关系，应用in case（倘若、以防万一）。故选A项。
68．A
【详解】考查连接词词义辨析。句意：虽然网上购物改变了我们的生活，但并不是所有的影响都是积极的。A. While然而；B. Because因为；C. If如果；D. Once一旦。根据not all of its effects have been positive可知，前后句之间为转折关系，所以用连接词while引导。故选A。
69．C
【详解】考查原因状语从句。句意：我喜欢城市，但我更喜欢乡村，因为我在那里有更多的朋友。根据句意可知，此处引导原因状语从句，in that“因为”符合句意。故选C。
70．D
【详解】考查连词。句意：这个小女孩中午不肯睡觉，除非她妈妈给她讲故事。A. or或者；B. but但是；C. if如果；D. unless除非，如果不。分析句子可知，句子为条件状语从句，如果妈妈不讲故事，女孩就不睡觉，unless意为“除非，如果不”，引导条件状语从句，符合句意。故选D项。
1．Posts should not give out personal information,________they should not include ads.
A．but B．so C．or D．and
2．According to the study’s lead author, the finding is________ there isn’t just one single health-related consequence of consuming coffee, ________that the reality is more complicated than that.
A．/, in B．that, / C．/, provided D．that, but
3．Addicted to shopping, I found that the items I bought lost their appeal right around ________ a new item caught my eye.
A．the second when B．a second when C．the second D．a second
4．________ I am willing to help you, I do not have much time available.
A．Since B．For that C．While D．When
5．A digital ring is locked on every newborn baby’s foot ________ they are taken by strangers out of the hospital.
A．Now that B．even if C．so that D．in case
6．_______ we’ll go hiking tomorrow depends on the weather.
A．If B．Whether C．That D．Why
7．In my opinion, the topic is too difficult to understand. Try to simplify your speech ______ it goes beyond the children.
A．even if B．as if C．in fact D．in case
8．We cannot accept a society _____ the rich enjoy comfort _____ the poor have to suffer.
A．which; while B．where; while C．that; which D．where; that
9．Which one of the following sentences is grammatically incorrect
A．The girl imagined her future college life to be challenging yet enlightening.
B．He is surprised to find that the man should be alive after being buried for hours.
C．With many problems to deal with, he went back to the office and started working.
D．There was no soup served for lunch or there was no vegetable served for dinner.
10．Demand for solar panels has shot up to unprecedented levels in Spain ___________ Europe’s energy crisis shows no sign of letting up, in a welcome boost for a sector with huge potential.
A．but B．though C．as D．while
11．________ Chinese ________ Japanese are Asians.
A．Both；and B．Neither；nor C．Neither；or D．Either；or
12．The family members were discussing where to take a trip during the winter vacation ________a tourist agent turned up at the house.
A．when B．while C．even if D．though
13．The shepherd and his dog set out early in the morning ________they could drive the flock of sheep to the valley before the noon.
A．because B．before C．so that D．while
14．We will suffer from the hazy weather more often than before ________ our air is being seriously polluted.
A．because B．unless C．until D．although
15．________ her disappointment, she ________ and managed a bright smile.
A．Though; moved on B．In spite of; took off C．As; settled down D．Despite; cheered up
16．________ I can remember, this is the third time we’ve met.
A．As soon as B．As long as C．As much as D．As far as
17．________ other companies still kept integrating fingerprint readers, Apple threw that out and made facial recognition work.
A．Once B．While C．Unless D．Since
18．-Shall we go out for a walk
-I'm afraid not. We can't go out________our work is being done.
A．before B．until C．as ` D．after
19．It’s more than half a century ________ my grandfather joined the Party and became a servant to the people.
A．when B．that C．since D．as
20．________you master an effective method to study French ________ make great progress in a short time.
A．Only if; will you B．Only if; you will
C．Unless; will you D．Unless; you will
21．Autumn is here. ________ time goes on,it's getting colder and colder.
A．As B．With C．Because D．Since
22．When a new movement in art contributes to a certain fashion, it is advisable to find out what its advocates are aiming at, for ________ unreasonable their principles may seem today, it is possible that in years to come they may be regarded as normal.
A．what B．however C．though D．which
23．He was so busy. He cannot afford enough time with his son ________ he really wants to.
A．as if B．even if C．in case D．before long
24．The farmer watered the vegetables in the field________they might grow better.
A．in case B．for fear that C．now that D．so that
25．Your parents won't be satisfied with you ________you pass the final examination.
A．until B．if C．unless D．otherwise
26．The last time we met each other was_________I was on a business trip in Beijing.
A．when B．how C．where D．why
27．It’s not surprising ________ you won the medal, considering how much you paid for it.
A．whether B．why C．because D．that
28．Mrs. Smith was cooking breakfast in the kitchen ________ she heard a loud knock at the door.
A．before B．since C．when D．while
29．Which one of the following sentences is the compound sentence(并列句)
A．Playing football and dancing are his favourites.
B．The good news is that this stormy period will not last.
C．You feel ready to be more responsible and make decisions on your own.
D．I don’t know what “home” is, but unhappiness and worries melt away once there.
30．The young man tried to stop, ________he drove too fast to stop.
A．and B．but C．so D．or
31．Her performance was perfect and, ________ the fact that there were other 20 participants, the first prize still belonged to her.
A．however B．while C．though D．despite
32．________ she welcomes the new enterpreneurial spirit, she advises that people be realistic and seek guidance________ rushing into things.
A．Since, when B．As, before
C．Though, before D．Although, when
33．________ tested positive for novel coronavirus, anyone living in China will receive free medical treatment from our government.
A．Until B．Unless C．Once D．Although
34．The old couple loves the boy ________ he were their own son.
A．even if B．unless C．as if D．though
35．We won’t get good grades in P. E ________ we keep exercising every day.
A．if B．because C．unless D．since
36．________there was no solid evidence, most people thought he was guilty.
A．Because B．While C．As D．Unless
37．We’ve missed the bus. It looks _________ we’ll have to walk home.
A．ever since B．as long as C．even though D．as though
38．________ focusing on what you lack, try noticing what you have. You may gradually feel better.
A．More than B．Other than C．Rather than D．Less than
39．Our English teacher is nice and patient ________ she is very strict with us.
A．if B．as C．although
40．Emily, you are playing video games again! Study hard, ________ you will fail in the coming exam.
A．then B．so C．and D．or
41．He insisted that he saw a UFO, ________ he couldn’t provide any solid evidence.
A．while B．otherwise C．yet D．however
42．There is no doubt ________ man will continue to explore the vast universe in the future，but the rate at which we approach depends on the development of technology.
A．whether B．what C．when D．that
43．—I don't know ________ to do with this maths problem. It's too hard.
—You can ask your classmates or teachers for help.
A．which B．how C．what D．when
44．Mexican and Tex-Mex foods were popular in the USA, ________ now Chinese food has more fans.
A．because B．but C．so D．unless
45．I was about to watch a football match ________ my mother called me to buy drinks.
A．while B．as C．when D．until
46．Chinese overseas students are encouraged to return, ________ they honestly fill out medical forms and strictly follow the quarantine（隔离期）rules.
A．though B．as long as C．unless D．as if
47．He made a serious mistake. But he took action to change that ________ it got worse.
A．until B．unless C．when D．before
48．Mr. Black walked around and offered help________ we were doing an experiment.
A．while B．although C．until D．unless
49．It is still not known if he succeeded in reaching the top of Qomolangma________ it took his life.
A．after B．before C．until D．since
50．Sue likes going to the shops and always spends money ______ there was no tomorrow.
A．even if B．as if C．as long as D．as soon as
51．_____, there seemed little hope that the adventurer would find his way through the vast rainforest.
A．Confused by the map
B．As he had been confused by the map
C．Having been confused by the map
D．He had been confused by the map
52．You can use a timer to count down to 15 minutes you won't need to constantly look at the clock to see how much time has gone.
A．even though B．now that C．in case D．so that
53．Tom was about to close the window__________his attention was caught by a bird.
A．when B．till C．while D．as
54．—Some Chinese students find it difficult to understand native speakers when in London.
—Exactly, _________ they’ve learned a lot about grammar and known many words.
A．if only B．now that C．as if D．even if
55．You will never achieve success _______ you keep working hard.
A．when B．if C．unless D．because
56．I was glad to meet Lydia again, _______ I didn't want to spend all day with her.
A．but B．and C．or D．so
57．______ I saw my father ,I burst into tears.
A．The instant B．both A and D C．At the instant D．Instantly
58．Take a taxi, you'll miss your train.
A．and B．if C．otherwise D．but
59． the outbreak of COVID-19 is a terrible blow to the country, the government is trying hard to bring the situation under control.
A．Although B．If C．Unless D．Because
60．Lose one hour in the morning ________ you will be looking for it the rest of the day.
A．but B．and C．or D．so
61．Pick yourself up. Courage is doing _______ you are afraid to do.
A．whether B．which C．how D．what
62．Ms. Ji had been thinking about what to cook for lunch the whole morning ________ all at once an authentic recipe for stewed eggplants ________ her on her drive home.
A．when; stuck B．while; struck C．when; struck D．while; stuck
63．Learning a foreign language is not easy， and it comes to speaking， it can be more difficult．
A．when B．unless C．once D．while
64．﹣﹣English is becoming so important．
﹣﹣It's true．Many university classes are taught in English ______ the native language is not English．
A．as if B．what if
C．as long as D．even though
65．_______ something unexpected happens, I'll see you tomorrow at school．
A．Before B．Unless C．Although D．Because
66．There is an illness that can result in total blindness ______ left untreated.
A．after B．if C．since D．unless
67．He always had his camera ready whenever he traveled, just he saw something that would make a good picture.
A．in case B．so that C．for fear that D．as if
68．_______ online shopping has changed our life, not all of its effects have been positive.
A．While B．Because C．If D．Once
69．I like the city, but I like the country better I have more friends there.
A．in which B．for which C．in that D．at that
70．The little girl won’t go to sleep at noon _______ her mother tells her a story.
A．or B．but C．if D．unless
参考答案：
1．D
【详解】考查并列连词。句意：帖子不应该透露个人信息，也不应该包含广告。A. but但是、而，表示转折关系；B. so因此、所以，表示因果关系；C. or或者、否则，表示选择关系；D. and和、并，表示并列关系。设空处前后两个句子均有should not，此处表示“不应该……也不应该……”，为并列关系，应用and。故选D项。
2．D
【详解】考查表语从句和连词。句意：根据该研究的主要作者的说法，这一发现表明，喝咖啡不仅会带来一个与健康相关的后果，而且现实情况比这更复杂。根据前文the finding is可知，空1处应用that引导表语从句，一般不省略；空2处可用并列连词but连接另一个表语从句。故选D项。
3．C
【详解】考查连词。句意：沉迷于购物的我发现，我买的东西一旦被新东西吸引，就会失去吸引力。分析句子结构可知，句中缺少连词，所以用连词短语the second，表示“一……就……”，引导时间状语从句。故选C。
4．C
【详解】考查从属连词辨析。句意：尽管我很愿意帮助你，但是我没有太多可用的时间。A. Since因为；B. For that因为；C. While虽然，尽管；D. When当……的时候。分析句子可知，“I am willing to help you”和“I do not have much time available”之间存在转折关系，空处应用while来连接两个句子，表示让步转折。故选C。
5．D
【详解】考查连接词词义辨析。句意：每个新生儿的脚上都锁着一个数字戒指，以防被陌生人带出医院。A. Now that既然；B. even if即使；C. so that因此；D. in case以防。根据句意可知，空后是前文做法的目的，应用“以防”引导目的状语从句。故选D项。
6．B
【详解】考查主语从句。句意： 明天我们是否去远足取决于天气。A. if是否；如果；B. Whether是否；C. That引导宾语从句，仅起引导作用，无词义；D. Why为什么。分析句子可知，空处引导主语从句，表示“是否”，if引导主语从句不能置于句首，故选B。
7．D
【详解】考查连词和固定短语辨析。句意：在我看来，这个话题太难理解了。尽量简化你的演讲，以免超出孩子们的理解范围。A. even if即使；B. as if似乎；C. in fact实际上；D. in case以免。由语意可知，这个话题太难理解了，因此才建议要简化演讲，以免孩子听不懂。D选项符合题意。故选D项。
8．B
【详解】考查定语从句和并列句。句意：我们不能接受一个富人享受舒适而穷人受苦的社会。分析句子可知，该句第一空引导的定语从句，先行词a society在从句中作地点状语成分，应用关系副词where；该句第二空为连词while连接的两个简单句，the rich enjoy comfort和the poor have to suffer是对比，while表示对比关系时，意思是“而，然而”。故选B项。
9．D
【详解】考查连词。题干问下面哪个句子在语法上是不正确的，A. The girl imagined her future college life to be challenging yet enlightening. 女孩想象着她未来的大学生活充满挑战，但也很有启发性.imagine something to be“想象” ，yet表示但是；B. He is surprised to find that the man should be alive after being buried for hours. 他惊讶地发现那个人被埋了几个小时后竟然还活着。形容词后用不定式，find后是宾语从句，介词后用动名词的被动形式；C. With many problems to deal with, he went back to the office and started working. There was no soup served for lunch or there was no vegetable served for dinner.由于有许多问题要处理，他回到办公室开始工作。with+宾语+动词不定式表示将来。D. There was no soup served for lunch or there was no vegetable served for dinner.午餐没有汤，晚餐也没有蔬菜。 D选项应该是并列句用and连接，不用or，故选D。
10．C
【详解】考查从属/并列连词。句意：由于欧洲的能源危机没有减弱的迹象，西班牙对太阳能电池板的需求已飙升至前所未有的水平，这对一个具有巨大潜力的行业来说是一个可喜的推动力。A. but但是；B. though尽管，虽然；C. as因为；D. while而。结合句意可知，空后表示原因，应用as引导原因状语从句，故选C。
11．A
【详解】考查连词。句意：中国人和日本人都是亚洲人。主语由both...and...接时，谓语动词用复数形式；由并列结构either...or....，neither...nor...接的并列主语，谓语动词与靠近的那个名词或代词的单复数保持一致。故选A。
12．A
【详解】考查连接词词义辨析。句意：一家人正在讨论寒假去哪里旅行，这时一个旅游代理人出现了。A. when在……时候；B. while与……同时；C. even if即使；D. though虽然。be doing sth. when...为固定句型，表示“正在做某事，这时……”，结合句意，该句适用该句型。故选A项。
13．C
【详解】考查连词。句意：牧羊人和他的狗一大早就出发了，这样他们就能在中午之前把羊群赶到山谷里。A. because因为；B. before在……以前；C. so that为了，以便；D. while 当……的时候。根据句意可知，“在中午之前把羊群赶到山谷里”是“牧羊人和他的狗一大早就出发”的目的，所以用连词so that 引导目的状语从句。故选C项。
14．A
【详解】考查连词。句意：我们将遭受雾霾天气比以前更频繁，因为我们的空气正受到严重污染。A.because因为；B.unless除非；C.until直到；D.although虽然。分析此句可知，上下句为因果关系，故选A。
15．D
【详解】考查介词/连词和动词短语词义辨析。尽管失望，她还是振作起来，露出灿烂的笑容。though/as尽管，应当让步性状语从句，后接句子；despite/in spite of尽管，后接名词或动名词作宾语；moved on继续；took off起飞；settled down定居；cheered up振作起来。结合结构和句意，her disappointment为名词，第一空格用despite/in spite of； 空格二为“振作起来”，用动词短语cheered up。故选D项。
16．D
【详解】考查连接词词义辨析。句意：就我能记得的而言，这是我们第三次见面。A. As soon as一……就……；B. As long as只要；C. As much as与……一样多；D. As far as就……而言。根据句意，空处应用as far as引导状语从句，表示“就……而言”。故选D项。
17．B
【详解】考查连词词义辨析。句意：当其他公司还在继续整合指纹识别器时，苹果放弃了这一做法，并启用了面部识别功能。A.Once 一......就；B.While当......时候；C. Unless除非；D. Since自从。根据句意可知，本句为while引导的时间状语从句。故选B项。
【点睛】
18．C
【详解】考查连词词义辨析。句意：——我们出去散散步好吗？——恐怕不行。我们不能出去，因为我们的工作正在进行中。A. before在……之前；B. until直到……为止；C. as因为；D. after在……之后。根据“our work is being done”可知，这是我们不能出去散步的原因。故选C。
19．C
【详解】考查连词。句意：我祖父入党为人民服务已经有半个多世纪了。A.when当......的时候；B.that那个； C.since自从；D.as因为。由后面的“my grandfather joined the Party”和前面的“It’s more than half a century”可知，句子表示“自从我祖父入党为人民服务以来已经有半个多世纪了”，因此空格处是“自从”，即since，故选C。
20．A
【详解】考查连词词义辨析和倒装句。句意：只有掌握了一种有效的法语学习方法，你才会在短时间内取得很大进步。 only if“只有”，unless“除非”，根据句意，空格一用only if引导条件状语从句，置于句首，主句用部分倒装，助动词will置于主语之前，根据“主将从现”原则，主句用一般将来时，综上，故选A。
21．A
【详解】考查连词。句意：秋天来了。随着时间的流逝，天气变得越来越冷了。A. as 随着；B. with 介词“有”； C. because 因为； D. 因为，既然,自从；分析句子结构可知空格所在句子为时间状语从句可知，表示“随着”，故选A项。
22．B
【详解】考查从属连词词义辨析。句意： 当一场新的艺术运动形成某种时尚时，理应弄清其倡导者的目标所在，因为无论他们的准则在今天看来是多么不可思议，将来都有可能被视为正常的。what什么；however 不管怎样；无论；though尽管；which哪一个。for引导的状语从句中包含一个让步状语从句，根据句意，修饰形容词unreasonable用副词however，表示“无论多么不可思议”，故选B。
23．B
【详解】考查连词词义辨析。句意：他太忙了，没有足够的时间陪他的儿子，即使他真的想（陪儿子）。A. as if好像；B. even if即使；C. in case万一；D. before long不久以后。根据句意，这里表示“他没有足够的时间陪他的儿子，即使他真的想（陪儿子）”，前后是让步关系，故选B。
24．D
【详解】考查连词。句意：那位农民在农田里给蔬菜浇水，目的是为了让这些菜能长得更好。A. in case万一；B. for fear that唯恐；C. now that既然；D. so that为了。根据句意可知，农民在农田里给蔬菜浇水的目的就是为了让这些菜能长得更好。故选D项。
25．C
【详解】考查连词词义辨析。句意：除非你期末考试及格，否则你父母不会对你满意的。A. until直到……才；B. if如果；C. unless除非；D. otherwise否则。根据句意，可知这里表示“除非你期末考试及格”，故选C。
26．A
【详解】考查从属连词。句意：我们最后一次见面是在我去北京出差的时候。A:when何时; B:how如何；C:where哪里；D:why为什么。此处为表语从句，从剧中缺少时间状语，故答案为A。
27．D
【详解】考查连词。句意：考虑到你的付出，你赢得这个奖牌一点也不令人吃惊。根据句子结构可知，“It”是形式主语，真正的主语是“______you won the medal”，所以空处引导主语从句。分析从句的句子结构和主从句的上下文意思可知，此空不做任何句子成分，不需要任何意思，只需要起到连接主从句的作用，符合连词“that”在主语从句中的用法。故选D项。
28．C
【详解】考查连词辨析。句意：史密斯太太正在厨房里做早餐，突然听到有人大声敲门。A.before在......之前； B. since自从；C. when正在那时；D.while尽管。be doing sth when...“正在做某事，正在那时......”。故选C项。
29．D
【详解】考查并列句。A项句意：踢足球和跳舞是他的最爱。B项句意：好消息是，这一风暴期不会持续。C项句意：你觉得自己已经准备好承担更多的责任，自己做决定。D项句意：我不知道“家”是什么，但不快乐和忧虑一旦到了那里就消失了。分析句子结构可知，AC项为并列结构，B项为表语从句，只有D项是由并列连词but所并列的句子，即并列句。故选D。
30．B
【详解】考查连词。句意：那个年轻人尽力停车，但他开得太快了以至于停不下来。A. and并且；B. but但是；C. so因此；D. or或者。分析前后两句，可知表示转折关系，用but。故选B。
31．D
【详解】考查连词。句意：她的表演非常完美，尽管还有其他20名参赛者，但一等奖仍然属于她。A.however然而；B.while尽管；C.though尽管；D.despite尽管。分析句子结构，前面有连词and，可知Her performance was perfect和后句the first prize still belonged to her是并列关系，the fact that there were other 20 participants是that引导的同位语从句，此句相当于一个the fact名词，而选项however一般后面有逗号隔开，作连接副词，后面接句子；while作连词，后面接句子；though作连词，后面接句子；despite作介词，后面接名词。故选D项。
32．C
【详解】考查让步状语从句和介词。句意：尽管她欣然接受企业家精神，她建议人们在匆忙投身某事之前应该基于现实并且寻求指导。根据句意可知，第一空引导让步状语从句，可用though或although 引导，as引导让步状语从句时，必须倒装；第二空意为“在……之前”，应用介词before。故选C项。
33．C
【详解】考查从属连词。句意：一旦新型冠状病毒检测呈阳性，所有在中国生活的人都将享受我国政府提供的免费医疗。A. Until直到；B. Unless除非；C. Once一旦；D. Although虽然。根据“anyone living in China will receive free medical treatment from our government.”可知此处表示“一旦”。故选C。
34．C
【详解】考查从属连词和虚拟语气。句意：这对老夫妇爱这个男孩，就好像他是他们自己的儿子一样。A. even if即使；B. unless除非；C. as if好像；D. though虽然，尽管。分析句子可知，句子为状语从句，从句部分为虚拟语气，再结合句意可知，空格处应用“as if”引导从句，意为“好像”，从句谓语动词动作与主句谓语动词动作同时发生，从句要用一般过去时，“be”动词要用“were”。故选C项。
35．C
【详解】考查连词词义辨析。句意：如果我们不能每天坚持锻炼，我们就不会在体育上取得好成绩。A. if如果；B. because因为；C. unless除非，如果不；D. since既然。根据句意可知，后文“we keep exercising every day”是前文的条件（否定），unless= if ... not， 故用unless引导条件状语从句，符合句意。故选C项。
36．B
【详解】考查连词。句意：尽管没有确凿的证据，但大多数人认为他有罪。A.because因为；B.while尽管；虽然；C.as因为；D.unless除非。前半句表示没有确凿证据，后半句表示人们认为他有罪，前后是转折关系，故选B。
37．D
【详解】考查连词短语词义辨析。句意：我们错过了公共汽车。看来我们好像得走着回家了。A. ever since自从那时起；B. as long as只要；C. even though即使；D. as though仿佛；好像。根据“We’ve missed the bus.”可知，因为没有公共汽车，所以好像要走着回家了。故选D。
38．C
【详解】考查短语词义辨析。句意：与其关注你所缺乏的，不如试着关注你所拥有的。你可能会逐渐感觉好些。A. More than不仅仅；B. Other than除了；C. Rather than与其……倒不如；D. Less than少于。根据“try noticing what you have.”可知，此处是指不要只关注你所缺乏的。故选C。
39．C
【详解】考查连词词义辨析。句意：虽然我们的英语老师对我们很严格，但她很和蔼，很有耐心。A. if如果；B. as因为；C. although虽然；尽管。根据前后句意可知，前后句为转折关系，所以用连词although。故选C。
40．D
【详解】考查连词词义辨析。句意：艾米丽，你又在玩电子游戏了！努力学习吧，否则你在接下来的考试中会不及格的。A. then然后，表顺承；B. so所以，表结果；C. and和，表并列；D. or否则，表条件。本句是“祈使句+or+陈述句”固定句型，表示在以祈使句为条件下的相反假设，意为“否则,要不然”。根据句意结构和语境，故选D。
41．C
【详解】考查并列连词。句意：他坚持称看到了外星人，但是他无法提供确凿的证据。根据句意可知“看到外星人”和“没有证据”造成了转折。故用转折连词yet，意为“然而、但是”符合题意。故选C项。
42．D
【详解】考查同位语从句。句意：毫无疑问，人类将在未来继续探索广阔的宇宙，但我们接近的速度取决于技术的发展。分析句子可知，空格后是同位语从句，解释说明doubt，从句句意完整，成分齐全，that引导同位语从句，无词义，不作成分，仅起引导作用，符合题意，故选D。
43．C
【详解】考查连接词。句意：——我不知道如何处理这道数学题。太难了。——你可以向你的同学或老师求助。此处是“连接词+动词不定式”作 don't know的宾语，由此处要作do的宾语，表示“什么”，可知要用what，what to do with“如何处理”。故选C项。
44．B
【详解】考查连词词义辨析。句意：墨西哥和德州-墨西哥食物曾在美国很受欢迎，但现在中国食物有更多的粉丝。A. because因为；B. but 但是；C. so所以；D. unless除非。上文提到墨西哥和德州-墨西哥食物曾在美国很受欢迎，后文说现在中国食物有更多的粉丝，前后为转折关系，应用连词but。故选B。
45．C
【详解】考查连词。句意：我正要去看足球比赛，这时我妈妈打电话叫我去买饮料。A.while在...期间，在...的过程中,（对比两件事物）而，虽然；B.as因为，在...时，随着；C.when在...时候，在...之后；D.until直到...为止。固定句式be about to do...when...“正要做某事...这时...”。故选C项。
46．B
【详解】考查连词词义辨析。句意：中国留学生被鼓励回国，只要他们诚实地填写医疗表格，严格遵守检疫规则。A. though尽管；B. as long as只要；C. unless除非；D. the moment一……就……。后文是条件状语，根据句意，故选B。
47．D
【详解】考查连接词词义辨析。句意：他犯了一个严重的错误。但他在情况恶化之前采取行动改变了这一点。A. until直到；B. unless除非；C. when当……的时候；D. before在……之前。根据He made a serious mistake. But推测后句句意：在变得更糟之前采取行动改变。故选D。
48．A
【详解】考查从属连词。句意：当我们做实验时，布莱克先生四处走动并提供帮助。A. while当……时；B. although虽然；C. until直到；D. unless如果不，除非。根据主句“Mr. Black walked around and offered help（布莱克先生四处走动并提供帮助）”和从句“we were doing an experiment（我们正在做实验）”可知，此处使用连词while“当……时”引导时间状语从句。故选A。
49．B
【详解】考查连接词词义辨析。句意：目前还不清楚他是否在丢掉性命之前成功登上珠穆朗玛峰峰顶。A. after 在……之后；B. before 在……之前；C. until 直到……；D. since 自从……以来。根据句意，此处表示他在珠穆朗玛峰上丢掉性命之前，是否登上了珠穆朗玛峰峰顶，现在还不知道。故选B。
50．B
【详解】考查连词辨析。句意：苏喜欢去商店买东西，总是像没有明天一样花钱。A.even if即使；B.as if好像；C.as long as只要；D.as soon as一......就......。从句使用的是虚拟语气，结合句意可知，此处用as if引导状语从句复合语境。故选B。
51．B
【详解】考查连词。句意：由于这张地图把他弄糊涂了，这位冒险家找到穿越这片广袤雨林的路的希望似乎不大。分析句子结构可知，第二句和第一句的主语不一致，所以前一句不能使用非谓语动词，两句之间存在因果关系，需要用连词as连接，故选B项。
52．D
【详解】考查状语从句。句意：你可以用计时器倒计时到15分钟，这样你就不用经常看钟来知道已经过去了多少时间了。A. even though即使；B. now that既然；C. in case以防万一；D. so that因此。分析句意可知，“You can use a timer to count down to 15 minutes”的目的是“you won't need to constantly look at the clock to see how much time has gone”，可知，句子是so that引导的目的状语从句。故选D项。
53．A
【详解】考查固定句式。句意：汤姆正要关窗户时，一只鸟引起了他的注意。固定句式be about to do sth. when …正要做某事的时候，这时某事发生了。故选A。
54．D
【详解】考查连词短语辨析。句意：——一些中国学生发现在伦敦时，理解当地人很困难。——确实是。即使他们已经学了许多语法，知道了许多单词。A.if only只要；B.now that既然；C.as if好像；D.even if即使。根据后面的exactly，“确实”，可知，后者同意前者所讲，“许多中国学生确实理解不了当地人”，因此和后面“他们学了许多语法和单词”是让步关系。故选D。
【点睛】
55．C
【详解】考查连词词义辨析。句意：除非你继续努力，否则你永远不会成功。A. when当……时候；B. if如果；C. unless除非；D. because因为。unless是从属连词，引导条件状语从句，含有否定意义，相当于if条件状语从句的否定形式，所以unless= if not。根据句意，unless符合题意，故选C。
56．A
【详解】考查连词。句意：我很高兴再次见到Lydia，但是我不想全天一直和她在一起。A. but但是；B. and和；C. or或者；D. so因此。根据句意可知，虽然再次见到Lydia很开心，但是不想一直陪着她，but表示转折，符合语境。故选A项。
57．B
【详解】考查连词。句意：我一看见我父亲，我就哭了。分析句子结构可知，设空处引导时间状语从句；再根据所给选项，A项the instant和D项instantly为连词，意为“一...（就）”，符合语境，所以两个选项都可以。故选B。
【点睛】
58．C
【详解】考查连词辨析。句意：打车吧，否则你会错过火车的。A.and并且；B.if如果；C.otherwise否则；D.but但是。说话者让对方打车，如果不这样的话就会错过火车。所以表达的意思为“否则”。故选C。
59．A
【详解】考查连词。句意:虽然新型冠状病毒肺炎的暴发对全国是非常严重的打击，但是政府正尽力掌控局势。A. although虽然；B. if如果；C. unless除非；D. because因为。根据句意可知，前后句为转折关系，设空处引导让步状语从句，意为“虽然”。故选A项。
60．B
【详解】考查连词词义辨析。句意：在早上失去的一个小时，你需要花费一天时间去弥补。A. but 但是；B. and而且；C. or 或者；D.so因此。结合后文“you will be looking for it the rest of the day”以及空前是以lose动词原形开头是祈使句，可知，此处是“祈使句+and+简单句”结构，前后文为并列关系。故选B。
61．D
【详解】考查从属连词辨析。句意：振作起来，勇气就是做你害怕做的事。A. whether是否；B. which 哪一个；C. how怎样；D. what什么。根据句意及句子结构可知，Courage is doing后跟宾语从句，而宾语从句中缺少宾语，且意为“......的事情”，应用连接代词what。故选D项。
62．C
【详解】考查连词和动词辨析。句意：整个上午，纪女士都在考虑午餐做什么，在开车回家的路上，她突然想到了一道正宗的炖茄子食谱。主句动作是延续性动词，从句动作是非延续性动词，要用when引导从句而不能用while。stuck是stick的过去式，表示“刺，伸出，粘住”，struck是 strike的过去式，表示“突然想到”，此处表示突然想到了一个食谱，用struck。故选C。
63．A
【详解】考查从属连词和固定句型。句意：学习一门外语并不容易，当谈到口语时，可能会更困难．A．when当…时候；B．unless除非；C．once一旦；D．while当…时候，虽然。根据句意可知，这里使用固定搭配when it comes to “当说到……的时候”。故选A。
64．D
【详解】考查从属连词。句意：——英语正变得如此重要。——真的如此，很多大学课程用英语教学，即使他们的母语不是英语。A.as if 好像；B.what if如果…会怎样；C. as long as只要；D even though即使。根据"Many university classes are taught in English"（很多大学课程用英语教学）和"the native language is not English"（他们的母语不是英语）可知两句之间是让步关系，所以答案是D。
65．B
【详解】考查从属连词辨析。句意：除非有意料之外（没有提前想到）的事情发生，否则我明天将会去学校见你。A. before在…之前；B. unless除非；C. although虽然；D. because因为。根据句意和各个选项的含义可知，这里用unless引导条件状语从句，表示日程安排的例外情况（除非有意外情况），故选B。
66．B
【详解】考查从属连词和状语从句中的省略。句意：有一种疾病如果不治疗就会导致完全失明。A. after 在……之后;B.if 如果；C.since自从；D.unless除非。根据句意可知，“不治疗”是“导致完全失明”的条件，故用if来引导条件状语从句，符合句意；从句主语与主句主语一致，且从句谓语中包含be动词，所以省略了从句的主语和be动词，还原后为“if it is left untreated”。故选B项。
67．A
【详解】考查连词。句意：每次旅行时，他总是把相机准备好，以防看到能拍出好照片的东西。A. in case万一； B. so that以便； C. for fear that唯恐；D. as if好像。前面的“他总是把相机准备好”跟后面的“看到能拍出好照片的东西”是假设条件关系，应用in case（倘若、以防万一）。故选A项。
68．A
【详解】考查连接词词义辨析。句意：虽然网上购物改变了我们的生活，但并不是所有的影响都是积极的。A. While然而；B. Because因为；C. If如果；D. Once一旦。根据not all of its effects have been positive可知，前后句之间为转折关系，所以用连接词while引导。故选A。
69．C
【详解】考查原因状语从句。句意：我喜欢城市，但我更喜欢乡村，因为我在那里有更多的朋友。根据句意可知，此处引导原因状语从句，in that“因为”符合句意。故选C。
70．D
【详解】考查连词。句意：这个小女孩中午不肯睡觉，除非她妈妈给她讲故事。A. or或者；B. but但是；C. if如果；D. unless除非，如果不。分析句子可知，句子为条件状语从句，如果妈妈不讲故事，女孩就不睡觉，unless意为“除非，如果不”，引导条件状语从句，符合句意。故选D项。