2021届高考二轮复习英语句法增分精练：17 复合句之原因状语从句 Word版含解析

2021年高考二轮复习英语句法知识查漏补缺增分练17
复合句之原因状语从句
1.He can’t attend the party __________ he is up to his academic paper.
A.while B.when C.because D.unless
2.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
3.Jenny was very sad over the loss of the photos she had shot in Canada, _________ this was a memory she especially treasured.
A.as B.if C.when D.where
4.______that you are grown up;you should no longer depend on your parents.
A.Since B.Now C.As D.Because
5.I really enjoy listening to music ________ it helps me relax and takes my mind away from other cares of the day.
A.because B.before
C.unless D.until
6.Julia was very sad over the loss of the photos she had shot at Canada, _________ this was a memory she especially treasured.
A.as B.if C.because of D.where
7.— Coach, can I continue with the training?
— Sorry, you can’t _______ you haven’t recovered from the knee injury.
A.until B.before C.as D.unless
8.Hydrogen is the fundamental element of the universe____it provides the building blocks from which the other elements are produced.
A.so that B.but that C.in that D.provided that
9.______she has earned her Ph D, she wants to find a job with higher pay.
A.As if B.In case C.Even though D.Now that
10.Human beings are different from animals________they can use language as a tool to communicate.
A.in which B.in that
C.for that D.for which
11.We can talk with friends on the Internet 　　　it’s easier and cheaper.
A.though B.as C.or D.but
12.It was Sunday. Marcus didn’t need to go to school, he didn’t get up until 9 a.m.
A.Unless B.When C.Though D.As
13.Mother Teresa _______ great contribution to the world peace, _______ she was awarded the Nobel Price in 1979.
A.might have made, because B.must have made, for
C.could have make, since D.should have make, as
14.Try to buy less______unnecessary shopping could become another source of pressure to the environment.
A.though B.unless C.because D.before
15.The damage is usually more serious on the first plant, but the neighbors, relatively speaking, stay safer __________ they heard the alarm and knew what to do.
A.though B.unless C.before D.because
16.Why not stay at home _____________the road is so slippery after the heavy snow?
A.since that B.now that C.then that D.after that
17.________ you have got a job, you should learn to be independent of your parents.
A.So B.Although C.Before D.Now that
18._____________fewer people send letters to one another, the number of people collecting stamps has been steadily in decline.
A.Before B.Although C.As D.If
19.Perhaps it was_____________ my father often published his poems in the newspapers that he became known through his literary works.
A.before B.when C.if D.because
20.He differed _________ other people __________ he always looked further ahead in his work.
A.from; in which B.from; in that C.with; in which D.with; in that
21.Prince Harry and his wife, Meghan, will give up the name “royal” ____ they withdraw from official duties and embrace new lives, the couple confirmed on Friday.
A.unless B.while C.as D.although
22.________ in the battle this morning, we sent the soldier to hospital in a hurry.
A.Being badly wounded B.Since he was badly wounded
C.Badly wounded D.Since badly wounded
23. ______ I failed in English a third time， I had no doubt about my gift for foreign languages.
A.Until B.When C.If D.Since
24.The secretary is so outstanding and popular _____ she knows how to get on well with other colleagues and balance the relationship between them.
A.as though B.even though
C.in case D.in that
25.Parents should take seriously their children’s requests for sunglasses eye protection is necessary in sunny weather.
A.because B.though C.unless D.if
26.Our core interests will be better safeguarded ________ CNS Shandong, China’s second aircraft earner, is in service.
A.as though B.if only C.even if D.now that
27.While hosting the Academy Awards, Billy Crystal always keeps a toothbrush with him __________ he started practicing stand-up as a child, he told himself jokes in front of the mirror, brushing his teeth.
A.because when B.because that C.when D.as
28. peer pressure has a stronger impact on teenagers than any amount of government intervention, it is not surprising that the government's efforts to fight against drug abuse will meet more resistance with younger consumers.
A.In that B.Given that C.On condition that D.Although
29. you paid for the taxi fare, please let me pay for our dinner.
A.Until B.Since C.Unless D.Although
30.It is hardly a surprise that there exists a food shortage, ______ the population of the small country has more than doubled within a decade.
A.given that B.so that
C.on condition that D.provided that
31.______ you have been sitting in front of the computer for two hours, you’d better take a break.
A.Even if B.Though C.Now that D.Unless
32.It was ________ I missed the early bus ________ I was late for school.
A.why；that B.because；that C.why；because D.because；why
33.______ you have seen he is in poor condition, you should understand why he has to take up two part-time jobs.
A.As long as B.Unless C.Now that D.While
34.Though Mike’s parents are upset _________ he often broke his promises, the way _________ he cared for that boy made them proud.
A.because; which B.that; which C.when; in which D.because; /
35.________ you can’t answer the question, perhaps we’d better ask someone else.
A.Though B.Unless C.Before D.Since
36.________ you are a student in this school, you should obey its rules.
A.Even if B.Even though
C.As if D.Now that
37.________ your car has something wrong, you don’t have to pick me up this afternoon.
A.While B.Now that
C.Even if D.If
38.The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
A.until B.because
C.though D.unless
39.You can’t use the computer now, ________ the upgrade of the system is under way.
A.until B.unless
C.as D.after
40.Studying online is popular among students in Suzhou，______they are free to choose what to learn and when in this way.
A.while B.if
C.though D.as
41.Why does she always drive to work ____ she could easily take the train?
A.unless B.until
C.before D.when
42.________ you have seen he is poor, you should understand why he has to take up two part-time jobs.
A.As long as B.Unless
C.Now that D.While
43.—We have decided to go for a picnic tomorrow, Jack. Are you going with us?
—Well, ______ you are going, so will I.
A.when B.since C.if D.while
44.________ offensive nicknames are seen as a form of bullying at school, next time you want to call someone by its nickname, weigh it before you do.
A.Since B.Unless C.Although D.Before
45.Steve Jobs is a key figure in the computer world _____ he has had a great influence on modern life and technology.
A.on condition that B.in case
C.in that D.as long as
答案与解析
1.C
【详解】
考查原因状语从句。句意：他不能参加派对因为他在写学术论文。A.while“当......时；在......期间”引导时间状语从句；B.when“当......时”，引导时间状语从句；C.because“因为，引导原因状语从句”；D.unless“除非，如果不”，引导条件状语从句。结合句意，可知空白处之后的内容为他不能来参加聚会的原因，所以选项C正确。故选C。
2.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。
3.A
【详解】
考查连词辨析。句意：珍妮对失去她在加拿大拍摄的照片感到非常悲伤，因为这是她特别珍视的记忆。as引导原因状语从句，表示“由于”；if“如果”；when“当……时候”；where“在哪里”。根据句意，前后文是因果关系，故选A。
【点睛】
4.B
【详解】
考查从属连词。句意：既然你长大了，就不应该再依靠你的父母。分析句意可知，本句为原因状语从句，原题已经给出that，所以用now that 引导原因状语从句。故选B项。
5.A
【详解】
考查原因状语从句。句意：我真的喜欢听音乐，因为它能让我放松，让我的大脑远离一天中的其他烦恼。A. because因为；B. before在……之前；C. unless除非；D. until直到。前后是因果关系，故选A。
【点睛】
从属连词的用法
1. 引导时间状语从句的从属连词
(1) 表示“当……时候”或“每当”的时间连词。主要有when, while, as, whenever。
例如：Don’t talk while you’re eating.
He came just as I was leaving.
(2) 表示“在……之前(或之后)”的时间连词。主要的有before, after。
例如：Try to finish your work before you leave.
(3) 表示“自从”或“直到”的时间连词。主要的有since, until, till。
例如：She’s been playing tennis since she was eight.
Never trouble trouble till trouble troubles you.
(4) 表示“一……就”的时间连词。主要的有as soon as, the moment, the minute, the second, the instant, immediately, directly, instantly, once, no sooner…than, hardly…when等。
例如：I’ll let you know as soon as I hear from her.
(5) 表示“上次”“下次”“每次”等的时间连词。主要的有every time(每次)，each time(每次)，(the) next time(下次)，any time(随时)，(the) last time(上次)，the first time(第一次)。
例如：I’ll tell him about it (the) next time I see him.
注意：every time, each time, any time前不用冠词，(the) next time, (the) last time中的冠词可以省略，而the first time中的冠词通常不能省略。
2. 引导条件状语从句的从属连词。这类连词主要有if, unless, as/so long as, in case等。
例如：Do you mind if I open the window?
注意：在条件状语从句中，通常要用一般现在时表示将来意义，而不能直接使用将来时态。不过，有时表示条件的 if之后可能用 will，但那不是将来时态。而是表示意愿或委婉的请求(will为情态动词)。
例如：If you will sit down for a few moments, I’ll tell the manager you’re here.
3. 引导原因状语从句的从属连词。主要有because, as, since, seeing (that), now (that), considering (that) 等。
例如：He distrusted me because I was new.
6.A
【详解】
考查状语从句。句意：茱莉亚对失去她在加拿大拍摄的照片感到非常悲伤，因为这是她特别珍视的一段记忆。A. as因为；B. if如果；C. because of因为，后跟短语；D.where……的地方。此处为原因状语从句，后跟句子，表示“因为”应用as。故选A。
7.C
【详解】
考查状语从句。句意：——教练，我能继续训练吗？——抱歉，不能，因为你的膝盖还没有康复。A. until直到……；B. before在……之前；C. as 因为；D. unless除非。此处为原因状语从句，表示“因为”应用as。故选C。
8.C
【详解】
考查短语辨析。句意：氢是宇宙的基本元素，因为它提供了其他元素赖以产生的基本元素。A. so that以致于；B. but that若非；C. in that因为；D. provided that假如，如果。此处为原因状语从句，表示“因为”应用 in that。故选C。
9.D
【详解】
考查状语从句。句意：既然她已经获得了博士学位，她想找一份薪水更高的工作。A. As if好像；B. In case万一，假使；C. Even though虽然，即使；D. Now that既然，因为。此处为原因状语从句，表示“既然”应用now that。故选D。
10.B
【详解】
考查状语从句。句意：人类不同于动物，因为人类可以把语言作为交流的工具。此处为原因状语从句，表示“因为”结合选项应用in that，作为从属连词。故选B。
11.B
【详解】
考查连词辨析。句意：我们可以在网上与朋友们聊天是因为它既容易又便宜。分析句意可知，前后为因果关系。故选B。
12.D
【详解】
考查状语从句。句意：那是星期天，因为马库斯不需要上学，所以他直到早上9点才起床。A. Unless除非；B. When当…时；C. Though虽然；D. As因为。根据语境：星期天了。因为马库斯不需要上学，所以直到9点才起床。结合选项，显然选项D符合题意，故选D。
13.B
【详解】
考查情态动词及原因状语从句。句意：特蕾莎修女对世界和平一定做出了巨大的贡献，因为她在1979年获得了诺贝尔奖。分析句子，情态动词+have done表示对过去的猜测。根据后句的“她获得了1979年诺贝奖”可以推测，特蕾莎修女对世界和平一定做了很多贡献。must have done 表示过去一定做了某事。A. might have made 可能已经做了；C. could have make 本来能够做；D. should have make 本应该做却……。分析句意，ACD皆不符合。另外根据“she was awarded the Nobel Price in 1979.”可知，第二空应填表示“因为”的引导词来引导原因状语从句。综合分析，故选B项。
14.C
【详解】
考查连词辨析。句意：尽量少购物，因为不必要的购物可能会对环境造成压力。A. though虽然；尽管；然而；B. unless除非；除……之外；C. because因为；D. before在……之前。分析句子可知，过多的购物从而产生的垃圾会对环境造成一定的影响，两者之间是因果关系，因此需选择表示因果的连词。故选C。
15.D
【详解】
考查原因状语从句。句意：第一个被攻击的植物受到的埙失通常更严重,但邻居们相对来说更安全因为它们听到警报,知道该怎么做。A. though尽管；B. unless除非；C. before在……之前；D. because因为。根据语境和句意可知，空后是前面的原因，是原因状语从句，故选D。
16.B
【详解】
考查原因状语从句。句意：大雪过后，既然路这么滑，为什么不呆在家里呢?本题两句话之间存在因果关系，只有now that“既然”表示原因。故选B。
【点睛】
now(that)引导的原因状语从句
now(that)因为；既然，通常可以和since换用。其中that可省去，用来表示一种新的情况，再加以推论。
Now(that) you’ve passed your test you can drive on your own.你既已考试合格，就可以独自开车了。
I do remember，now (that) you mention it. 你这一提，我倒的确想起来了。
17.D
【详解】
考查原因状语从句。句意：既然你已经找到了工作，你应该学会独立于你的父母。A. So所以；B. Although尽管；C. Before在……之前；D. Now that既然。据语境，你"既然"有了自己的工作，就应该独立了。now that引导原因状语从句，相当于since。故选D。
18.C
【详解】
考查as引导的原因状语从句。句意：因为越来越少的人互相寄信，因此集邮的人数在持续减少。A. Before在……之前； B. Although 尽管；C. As 由于；D. If如果。主句与从句之间有因果关系，故选as。
19.D
【详解】
考查原因状语从句。句意：也许是因为我父亲经常在报纸上发表他的诗歌，才使他的文学作品为人所知。A. before在……前；B. when当……时候；C. if如果；D. because因为。分析句子结构可知此处为强调句型，且被强调部分是原因状语从句，所以用because引导，其他选项不符合语境。故选D。
20.B
【详解】
考查动词短语辨析和原因状语从句。句意：他与别人的不同之处在于他在工作中总是看得更远。第一空是differ相关短语的辨析：differ from与……不同， differ with与（某人）持不同意见，与……不一致；第二空：in that意思为：因为；由于；既然，后接从句；in which常引导定语从句。分析句子结构，后面是原因状语从句，应用in that。故选B项。
21.C
【详解】
考查原因状语从句。句意：哈里王子和他的妻子梅根周五证实，他们将放弃“皇家”的名字，因为他们撤出皇室的各种责任，拥抱新的生活。A. unless除非；B. while然而；C. as因为；D. although尽管。由上下文可知，因为他们撤出皇室的各种责任，所以他们会放弃皇室的名誉和头衔。所填空后是空前的原因，as可引导原因状语从句。故选C项。
22.B
【详解】
考查状语从句。句意：因为他在今天早上的战役中受了严重的伤，我们迅速把这个战士送往医院。结合句子结构和句意可知，本句考查since引导的原因状语从句；因为“受伤”这个动作和句子主语we之间没有任何逻辑上的关系，故不能使用非谓语动词，故选B项。
23.D
【详解】
考查状语从句连词。句意：由于我的英语再一次考砸了，我才开始怀疑我的外语语言学习能力。根据句意可知，前后句是因果关系，故用since引导原因状语从句，when和until引导时间状语从句，if引导条件状语从句，与题意不符，故选D。
24.D
【详解】
考查状语从句的用法。句意：这个秘书表现地很卓越并且很受欢迎，因为她知道如何和别的同事好好相处并且能够平衡之间的关系。A: as though好像，似乎；B: even though 即使，虽然；C: in case 以防，万一。in that放在句中等于because。故选D。
25.A
【详解】
考查连词词义辨析。句意：父母应该认真对待孩子对太阳镜的需求，因为在晴朗的天气里保护眼睛是必要的。A. because因为；B. though虽然，尽管；C. unless除非；D. if假如，如果。分析句子可知，本句为because引导的原因状语从句。故选A项。
26.D
【解析】
【详解】
考查连接词辨析。句意：由于中国的第二大飞机制造商——CNS山东公司投入运营，我们的核心利益将得到更好的维护。A. as though好像；B. if only如果只有；C. even if即使；D. now that由于，因为。根据句意可知，此处用“因为”符合语境，空前是结果，空后是原因。故选D项。
27.A
【详解】
考查原因状语从句和时间状语从句。句意：在主持奥斯卡颁奖典礼时，比利·克里斯托总是随身带着一把牙刷，因为当他还是个孩子的时候就开始练习站立表演，他一边刷牙一边对着镜子给自己讲笑话。结合语境，__________ he started practicing stand-up as a child, he told himself jokes in front of the mirror, brushing his teeth是原因状语从句，应用because引导。且在该原因状语从句中，he started practicing stand-up as a child是时间状语从句，应用when引导，he told himself jokes in front of the mirror, brushing his teeth是主句。综上，故选A。
28.B
【详解】
考查状语从句的引导词。句意：考虑到同辈压力对青少年的影响比任何数量的政府干预都要大，政府打击药物滥用的努力会遇到更多年轻消费者的抵制也就不足为奇了。A. In that由于，在于；B. Given that鉴于，考虑到。C. On condition that条件是......；D. Although虽然，然而。根据前后的语境可知，前面表达的是原因，后面是结果。“given that...”意为“考虑到....”引导原因状语从句。而in that引导原因状语从句时，一般不能置于句首。故选B。
29.B
【详解】
考查连词辨析。句意：既然你付了计程车费，请让我付晚餐的钱。A. Until直到；B. Since既然；C. Unless除非；D. Although尽管。本句为原因状语从句，表示“既然”，故选B。
【点睛】
英语原因状语从句用法归纳
1. 引导原因状语从句的从属连词主要有because, as, since, seeing (that), now (that)等：
I went to bed early because I was tired. 我因为疲倦所以早睡了。
Since you've spilt the milk, you'll have to mop it up. 既然你把牛奶溅出来了, 你就该把它清理干净。
Now that we are alone, we can speak freely. 现在我们单独在一起，可以随便谈了。
2. 除以上提到的大家比较熟悉的引导原因状语从句的从属连词外，when有时也可引导原因状语从句，其意“既然”。如：
I can’t tell you when you won't listen. 既然你不想听，我就不告诉你了。
3. 有关原因状语从句还应注意以下几点：
(1) as 与 since, now that 一样表示双方都知道的原因，通常位于主句前，且均不可用于强调结构被强调。
(2) 当表示直接的因果关系，回答 why 时，或有 only, just, all, partly, not, but 等副词修饰时，或用在强调结构中都只能用 because。
(3) for 有时也可引出表示原因的分句，但它只能位于后面，对前一分句加以解释或推断。
30.A
【详解】
考查状语从句连词。句意：鉴于这个小国的人口在10年之内不止翻了一番，存在食物短缺的现象就不足为奇了。A. given that鉴于，考虑到；B. so that以便，因此；C. on condition that假如；D. provided that假如。结合句意，此处应译为“考虑到/鉴于”。故选A项。
31.C
【详解】
考查状语从句。句意：既然你已经在电脑前坐了两个小时了，你最好休息一下。A. Even if 即使；B. Though尽管；C. Now that既然；D. Unless除非。此处是now that引导的原因状语从句，故选C项。
32.B
【详解】
考查强调句和原因状语从句。句意：正是因为我错过了早班车，所以上学迟到了。第一个空表示“因为……”，引导原因状语从句，用because；把It was和第二个空去掉，这个句子结构完整，语义清晰，是一个强调句，强调句的基本结构是it is/ was + 被强调部分 + that + 句子的其他成分，故选B。
33.C
【详解】
考查连词辨析。句意：既然你已经看到他状况不佳，你就应该明白为什么他不得不从事两份兼职工作。A. As long as只要；B. Unless除非；C. Now that既然； D. While尽管。根据题意，故选C。
34.D
【详解】
考查从属连词和关系代词。句意：尽管迈克的父母因为他经常违背诺言而感到焦虑，但他对那个男孩的关心使他们感到骄傲。分析句子可知，迈克因为经常违背诺言而使父母感到不安。所以第一个空为because引导的原因状语从句。再分析，way为先行词，关系代词为in which/that/不填。故选D项。
35.D
【解析】
考查连词辨析。句意：既然你无法回答这个问题，也许我们最好再问问别人。根据句意可知，前后为因果关系，故用Since，在此意为“既然”，引导原因状语从句，故选D。
36.D
【解析】
考查连词辨析。句意：既然你是这所学校的学生，你就应该遵守它的规定。A. even if意为“即使，虽然”；B. even though虽然；即使；C. as if意为“似乎，好像”；D. now that意为“既然，由于”。根据句意可知，此处表示原因，故选D。
37.B
【解析】
考查连词词义辨析。A. While虽然；B. Now that既然；C. Even if尽管；D. If如果。句意：既然你的车出了问题，那么你今天下午就不用来接我了。根据句意可知此处表示“既然”，引导原因状语从句，故B项正确。
38.B
【详解】
考查连词。句意：这个科学家研究自然不是因为这样做有用。他研究自然是因为他从中会得到快乐。A. until直到；B. because因为；C. though尽管；D. unless除非。由下一句提示可知，本句为because引导的原因状语从句。故B选项正确。
39.C
【解析】
考查状语从句的连词。句意：你现在不能用电脑，因为系统正在升级。A. until 直到；B. unless 除非；C. as 因为，当……的时候；D. after 在……之后。本题是一个原因状语从句，故选C。
【点睛】
本题考查原因状语从句。引导原因状语从句的连词有：because(语气最强，可被强调，对why回答)； since=now that(既然)；as(由于)；seeing (that)/considering (that)/given (that)(考虑到)；for(不置句首，表推测性原因) ；in that(原因在于)； not that…but that…(不是因为，而是因为)。状语从句连词的考查，主要就是考查句子间的逻辑关系。掌握好这些连词，状语从句就不难解了。
40.D
【解析】
【详解】
考查连词辨析。句意：在苏州，网上学习很受学生欢迎，因为用这种方法你可以自由选择学习的时间和内容。根据句意可知，前后句子之间是因果关系，只有D符合选项， A表示当…时候，或者用在句子中间表转折， B表假设，C表让步，都不符合，故选D。
41.D
【解析】
考查从属连词的用法。句意:坐火车上班很方便，为何她还总要自己开车去呢？A. unless除非；B. until直到...；C. before在...之前；D. when既然。此处when的意思是＂既然＂符合句意。故D选项正确。
42.C
【解析】
【详解】
考查连词。句意：既然你已经看到他很穷，你就应该明白他为什么要做两份兼职工作。A. As long as只要；B. Unless除非；C. Now that既然；D. While然而。结合前后两句的句意可知，这是个原因状语从句，结合四个选项可知，要用now that引导，故选C。
43.B
【详解】
考查原因状语从句。句意：——杰克，我们决定明天去野餐。你和我们一起去吗？——嗯，既然你们要去，那么我也去。A. when当……时候；B. since既然；C. if如果；D. while当……时候。结合句意可知，此处是since引导的原因状语从句，故选B。
44.A
【解析】
考查状语从句。A. Since既然； B. Unless除非； C. Although尽管； D. Before在------之前。句意：因为在学校，无礼的昵称被视为一种欺凌行为，所以下次你想叫别人的昵称时，一定要三思而后行。此处是since引导的原因状语从句，故选A。
45.C
【详解】
考查固定短语辨析。句意：史蒂夫·乔布斯是计算机世界的关键人物，因为他对现代生活和技术产生了巨大的影响。文中表示“因为…”，A. on condition that如果；B. in case万一；C. in that因为；D. as long as只要，故选C。