中小学教育资源及组卷应用平台
状语从句(时间、原因和地点状语) 高频考点梳理
专题练 2026届高考英语复习备考
一、语法填空
1.The young athlete didn’t stop training hard he achieved his goal of winning the gold medal in the national competition. (用适当的词填空)
2.He (not go to bed) until his mother returned. (用适当的词填空)
3. moment they arrived at the scene, they immediately joined their Turkish partners to carry out a rescue plan and saved the woman. (用适当的词填空)
4.He was about to leave the office to catch the last bus his boss called him to handle an urgent task. (用适当的词填空)
5.It’s been years they were dusty little rooms with books. (用适当的词填空)
6.I dreamed of entering cycle races I flew to San Diego to visit my sister. (用适当的词填空)
7. I was walking in the park, I met an old friend. (用适当的词填空)
8. the lions were awakened, they performed a lively flying dance. (用适当的词填空)
9.While breaking long walks into short intervals might not be practical in terms of length covered, Luciano emphasized that possible, people should take a few steps to break up sitting time. (用适当的词填空)
10.They kept very much to themselves. In my opinion, in trouble, we should seek help from those we trust most. (用适当的词填空)
11.Plant trees the soil is fertile enough to help them grow well and improve the local ecological environment. (用适当的词填空)
12.The government will build more public libraries people need them most, especially in remote rural areas. (用适当的词填空)
13. there is a will, there is a way, and this old saying has encouraged many people to pursue their dreams. (用适当的词填空)
14.Plant the flowers there is enough sunlight. (用适当的词填空)
15. there is strong and coordinated anti-nuclear opinion, governments must win support by showing there are better safeguards against accidents and new ways to store waste, as our report from Finland explains. (用适当的词填空)
16.If you happen to get lost in the wild, you’d better stay you are and wait for help. (用适当的词填空)
17.One day, I had a problem with my Physics homework. I was very worried I didn’t understand it at all. (用适当的词填空)
18.I was very satisfied no one could tell I was wearing the false teeth. (用适当的词填空)
19.Now we are all part of the global village, everyone becomes a neighbour. (用适当的词填空)
20.Now we have finished the design, it is time to construct the bridge in their turn. (用适当的词填空)
21.It can be concluded that restaurant keepers need not “be overly concerned about ‘bad’ tables,” given they’re profitable. (用适当的词填空)
二、单项选择
22.Tu Youyou knew that if she and her team didn’t come up with a new treatment, it was only a matter of time ________ more people died of this mosquito- ________ disease.
A.before... borne B.when... bearing
C.whether... carrying D.when... infected
23.You can’t drive a car ________ you get your driver’s license.
A.until B.if C.since D.while
24.I didn’t realize I had left my keys at home ________ I got to the office.
A.until B.as soon as C.since D.where
25.________ she was cooking, her son was doing homework.
A.When B.While C.As soon as D.After
26.We have known each other ________ we were in primary school.
A.when B.since C.after D.before
27.After-school activities can make a great difference ________ US and UK students apply to college.
A.how B.when C.where D.although
28.______ had she entered the room ______ she felt something unusual.
A.Hard; when B.No sooner; than C.Not until; that D.As soon as; when
29.______yesterday did we complete the tough task.
A.When B.While C.Not until D.Until
30.We should build a school ________ the children need it most.
A.where B.when C.if D.because
31.Though it was against his parents’ expectations. Zhang Tian thought he should teach _______ he was needed most.
A.where B.which C.in where D.in which
32.______ there are dreams and hard work, there is success.
A.Where
B.Whenever
C.Whether
D.Whatever
33.“You should put the book ________ you found it.” The librarian gently reminded.
A.when B.where C.that D.wherever
34.I want to put the photo ______ I can see it every day because it can remind me of the happy days I spent in Tianjin No.47 high school.
A.where; which B.where; when C.in which; which D.in which; when
35.Earthworms occur ________ adequate moisture and food and the necessary soil conditions are found.
A.however B.and C.wherever D.but
36.________ everyone’s cellphone can take professional-quality photos, more people are sharing their lives through visual storytelling.
A.In case B.In order that C.Now that D.As if
37.________ you are here, you can help me with the cleaning.
A.As B.If C.Unless D.When
38.I can’t go to the party tonight, ______ I have to work late.
A.though B.while C.as D.once
39.It was ________ Laura posted some false information on the Internet ________ she was arrested.
A.because; so B.for; so
C.because; that D.unless; that
40.________ the theme of the Expo was to promote cultural exchange and strengthen mutual cooperation between the countries along the Silk Road, Dunhuang was the ideal place.
A.Provided that B.So that C.Given that D.In order that
41.______ you are here, you can help me with the housework.
A.Now that B.Because of C.As for D.Even if
42.— Why didn’t Lucy go to school yesterday
— ________ she was uncomfortable.
A.Because B.But C.If D.When
43.Tom ate all the cakes ________ he was very hungry.
A.until B.if
C.or D.because
44.Chinese martial arts imitate animal movements ______ they admire animals’ natural abilities.
A.because B.though C.until D.if
45.______ technology makes communication faster and easier, people can stay connected with loved ones from afar.
A.Until B.Unless C.Although D.Since
46.Mary didn’t attend the meeting yesterday ______ she was ill.
A.if B.because C.though D.unless
三、完成句子
47.我怎么能一边记笔记一边认真听讲呢
How can I listen carefully
48. , it’s getting warmer and warmer.
随着时间的推移,天气变得越来越暖和了。
49.Next year he will be 18 and he will graduate from Zhejiang University.
→ , he will graduate from Zhejiang University.(用 by the time 引导时间状语从句改写)
50. , I think of my first English teacher.
每次我经过学校时,我都想起了我的第一位英语老师。
51.留得青山在,不怕没柴烧。(where引导地点状语)
there is life, there is hope.
52.战后,一所新学校在以前的剧院处建成。(状语从句)
After the war, a new s school building was put up .
53. everyone makes mistakes, you shouldn’t always criticise him.
既然每个人都会犯错误,你不应该老是批评他。
54.My adviser recommended that I should sign up for advanced literature I like English and I'm good at it.
因为我喜欢英语而且擅长英语, 我的指导老师建议我报名高级文学。
55. it’s hard to avoid a disaster on Earth, perhaps I should start thinking about moving to space...
既然在地球上很难避免灾难,或许我应该开始思考移民去太空……
56.Instead of looking back with regret, we should be facing our future with energy and optimism, the choices are ours, and ours only.
我们不应该带着遗憾回顾过去,而是应该充满活力和乐观地去面对未来,因为选择是我们的,而且只属于我们。
参考答案
题号 22 23 24 25 26 27 28 29 30 31
答案 A A A B B B B C A A
题号 32 33 34 35 36 37 38 39 40 41
答案 A B A C C A C C C A
题号 42 43 44 45 46
答案 A D A D B
1.until/till
【详解】考查连词。句意:这位年轻的运动员一直刻苦训练,直到在全国比赛中实现了赢得金牌的目标才停止。根据“didn’t stop training hard”与“achieved his goal”的逻辑关系可知,此处是not... until/ till...,意为“直到……才……”,此处需填入连词until/ till,连接主句和时间状语从句,表动作持续的终点。故填until/ till。
2.didn’t go to bed
【详解】考时间状语从句时态。句意:直到妈妈回来,他才上床睡觉。“not…until…”表“直到……才”,结合returned可知用一般过去时,否定形式为“didn’t+动词原形”,故填“didn’t go to bed”。
3.The
【详解】考查冠词和时间状语从句。句意:他们一到现场,就立即与土耳其伙伴合作执行救援计划,并成功救出那名女子。固定短语the moment意为“一……就……”,引导时间状语从句,位于句首,单词首字母应大写。故填The。
4.when
【详解】考查状语从句。句意:他正要离开办公室去赶末班车,这时老板叫他处理一项紧急任务。空后为完整的句子,结合前面的“was about to leave the office”可知,应用be about to do when…表示“正要/即将做某事时突然发生某事”,描述两个连续发生的动作,其中后一个动作打断了前一个动作的进行,when引导时间状语从句。故填when。
5.since
【详解】考查连词。句意:那些满是灰尘的小房间已经好几年没放书了。“It’s been + 时间段 + since 从句” 为固定句型,表示“自从……以来已经过了……时间”,since时间状语从句中需用一般过去时。符合语境和从句用过去时的语法规则,故填since。
6.until
【详解】考查连词。句意:我一直梦想着参加自行车比赛,直到我飞去圣地亚哥看望我姐姐/妹妹。空处应填连词,连接上下文句子,结合句意可知,此处指梦想参加自行车比赛的状态一直持续到“我”去圣地亚哥看望姐姐/妹妹,因此用until“直到”引导时间状语从句。故填until。
7.While/When
【详解】考查时间状语从句。句意:当我在公园散步时,我遇到了一位老朋友。由I was walking in the park, I met an old friend可知,从句表示“当我在公园散步时”,空格处意为“当……的时候”,用while/when引导时间状语从句,位于句首,首字母大写,故填While/When。
8.After/When/As/Once
【详解】考查连接词。句意:狮子被唤醒后/狮子被唤醒时/一旦狮子被唤醒了,它们表演了/就表演一个活泼的飞舞。分析句子和句意可知,空处引导时间状语从句,可表示“狮子被唤醒后”或“狮子被唤醒时”或“一旦狮子被唤醒了”,故可用连接词after或when或as或once;且句首时首字母应大写。故填After/When/As/Once。
9.whenever/when/if
【详解】考查状语从句省略。句意:虽然将长时间的步行分成短时间的间隔可能不太实际,但卢西亚诺强调,只要有可能/在任何可能的时候,人们应该采取一些措施来打破坐着的时间。分析句子结构可知,此处表示“在任何可能的时候,人们都应该起身走几步,打破长时间的久坐”,因此可使用whenever/when引导时间状语从句,其完整形式是 whenever/when it is possible,此处也可以表示“如果可能的话”,因此可以使用if引导条件状语从句,其完整形式是if it is possible。故填whenever/when/if。
10.when/whenever
【详解】考查状语从句连接词。句意:他们很少与人来往。依我看,当遇到麻烦时,我们应该向最信任的人寻求帮助。分析句子结构可知,“______ in trouble”在句中作时间状语,表示“当遇到麻烦时”。根据语境,此处需填入表示“当……时”或“每当……”的连接词,引导时间状语从句。when 和 whenever 均符合语境,when 强调特定时间点,whenever 强调任何时间。此处“When/ Whenever in trouble”是“When/ Whenever we are in trouble”的省略形式,其规则是“主句和从句的主语一致,且从句谓语含be动词时,从句的主语和be动词可以省略”。故填 when/whenever。
11.where
【详解】考查状语从句。句意:在土壤足够肥沃、有助于树木良好生长并改善当地生态环境的地方植树。Plant trees是主句,______the soil is fertile enough to help them grow well and improve the local ecological environment是地点状语从句,交代植树的地点是土壤足够肥沃、有助于树木良好生长并改善当地生态环境,where表示“在……的地方”。故填where。
12.where
【详解】考查地点状语从句。句意:政府将在人们最需要的地方建造更多的公共图书馆,特别是在偏远的农村地区。分析句子可知,设空处引导状语从句,结合句意可知,从句修饰“build”,说明建设图书馆的地点标准是“人们最需要的地方”,所以为连接副词where引导地点状语从句。故填where。
13.Where
【详解】考查地点状语从句。句意:有志者事竟成,这句古老的谚语鼓励了许多人追求自己的梦想。本空引导地点状语从句,表示“在……的地方”,用where引导,句首单词,首字母大写。故填Where。
14.where
【详解】考查地点状语从句。句意:在有足够阳光的地方种花。空处引导地点状语从句,表示“……的地方”,应用连接副词where引导从句,故填where。
15. Where that
【详解】考查地点状语从句和宾语从句。句意:正如我们在芬兰的报道所解释的那样,在存在强烈而协调一致的反核意见的地方,政府必须通过展示有更好的事故防范措施和储存废物的新方法来赢得支持。分析句子可知,该句第一空根据语境“在有强烈且协调一致的反核舆论的地方,政府必须……”,此处需要表示“在…… 地方”的引导词,因此用“Where”引导地点状语从句,强调“在存在反核舆论的场所 / 情况下”。该句第二空“showing”后接宾语从句,从句“there are better safeguards... and new ways to store waste”是完整的陈述句,不缺成分,因此用“that”引导,仅起连接作用,无实际意义。故分别填Where;that。
16.where
【详解】考查地点状语从句。句意:如果你碰巧在野外迷路了,你最好待在原地等待救援。分析句子结构可知,stay 在句中为不及物动词,空处应是地点状语从句的引导词,用以表明stay这一动作发生的地点,应用where引导。故填 where。
17.because
【详解】考查状语从句。句意:一天,我在物理作业上遇到了问题。我很担心,因为我完全不懂。根据句意可知,前后两个句子之间存在因果关系,前半句是结果,后半句是原因,应用because“因为”引导原因状语从句。故填because。
18.since
【详解】考查连词。句意:我非常满意,因为没有人能看出我戴着假牙。结合句意,“no one could tell I was wearing the false teeth”作原因状语从句,表示已知或显而易见的原因,用从属连词since引导从句,意为“因为,由于”。故填since。
19.that
【详解】考查原因状语从句。句意:既然我们都是地球村的一部分,每个人都成为邻居。表示“既然”,用now that,引导原因状语从句。故填that。
20.that
【详解】考查原因状语从句。句意:既然我们已经完成了设计,现在该轮到他们建造这座桥了。此处是now that引导的原因状语从句,意为“既然,由于”,故填that。
21.that
【详解】考查连词。句意:由此可以得出结论,考虑到这些“差”桌是有利可图的,餐馆老板们不必“过分担心它们”。given that...为固定短语,意为“考虑到,鉴于”,引导原因状语从句,符合句意。故填that。
22.A
【详解】考查连词和复合形容词。句意:屠呦呦知道,如果她和她的团队不能想出一种新的治疗方法,更多的人死于这种蚊子传播的疾病只是时间问题。第一空处“it was only a matter of time before...”是一个固定句型,意思是“在……之前只是时间问题”,用连词before引导时间状语从句;第二空处“mosquito-borne”是一个复合形容词,意思是“蚊子传播的”,后缀-borne意思是“由……携带的”,构成复合形容词mosquito-borne作定语。故选A项。
23.A
【详解】考查时间状语从句。句意:直到你拿到驾照,你才能开车。A. until直到……为止;B. if如果;C. since自从;D. while当……时候。结合“you get your driver’s license”可知,空格处应表达“直到……为止”,用until引导时间状语从句,表示“直到拿到驾照才能开车”,符合逻辑。故选A。
24.A
【详解】考查时间状语从句引导词。句意:直到到了办公室,我才意识到把钥匙忘在家里了。not…until…表“直到……才”,符合语境;as soon as表“一……就”,since表“自从”,where表地点,故选A。
25.B
【详解】考查时间状语从句引导词。句意:她做饭时,儿子正在做作业。A. When当……时;B. While在……期间;C. As soon as一……就……;D. After在……以后。主从句均为进行时,表“同时进行”用“while”引导时间状语从句。故选B。
26.B
【详解】考查时间状语从句引导词。句意:自从小学时我们就认识了。A. when当;B. since自从;C. after在……之后;D. before在……之前。主句为现在完成时,表示“自从”应用since引导时间状语从句。故选B。
27.B
【详解】考查连词。句意:课外活动在英美学生申请大学时可以产生很大影响。A. how如何;B. when当……时候;C. where在……的地方;D. although尽管。根据句意可知,本句为when引导的时间状语从句。故选B项。
28.B
【详解】考查倒装句型和时间状语从句。句意:她一进房间就感到有些不寻常。分析句子可知,这是一个倒装句型。看到had she entered 这个部分倒装结构,我们会联想到“一……就……”的表达句型:Hardly/Scarcely...when...和No sooner...than...;not until位于句首时,主句倒装,从句不到装,as soon as不和when搭配。故选B项。
29.C
【详解】考查倒装句和时间状语从句。句意:直到昨天我们才完成这项艰巨的任务。主句是倒装语序:did we complete...。在时间状语从句中,只有当 Not until 位于句首时,主句才需要使用部分倒装(助动词/情态动词/be动词提到主语前面)。故选C项。
30.A
【详解】考查地点状语从句。句意:我们应该在孩子们最需要的地方建一所学校。A. where在……地方;B. when当……时候;C. if如果;D. because因为。句中“the children need it most”是一个地点状语从句,表示“在孩子们最需要的地方”,应用从属连词where引导地点状语从句。故选A项。
31.A
【详解】考查状语从句。句意:尽管这违背了他父母的期望,但张天认为他应该去最需要他的地方教学。“_______ he was needed most”为地点状语从句,表示“……的地方”,应用where引导该从句。故选A。
32.A
【详解】考查地点状语从句。句意:哪里有梦想和努力,哪里就有成功。分析句子可知,设空处引导状语从句,句子逻辑为“有梦想和努力的地方,就有成功”,需用where引导地点状语从句,表示“……的地方”。故选A项。
33.B
【详解】考查地点状语从句。句意:“你应该把这本书放回你发现它的那个地方(原来的地方)。”图书管理员温和地提醒道。A. when什么时候,……的时候;B. where哪里,在……地方;C. that无实义,用于某些动词和形容词后,引出从句;D. wherever无论哪里。“_______ you found it”为地点状语从句,修饰主句动词“put”,表示放书的具体位置,表达特定地点,用where引导。故选B项。
34.A
【详解】考查定语从句和状语从句。句意:我想把照片放在我每天都能看到的地方,因为它能让我想起我在天津市第四十七中学度过的快乐时光。第一个空处表示照片放置的位置,所以需要where引导地点状语从句;第二空处需要引导定语从句,修饰先行词the happy days,先行词指物,在定语从句中作宾语,所以用关系代词which引导该从句。故选A。
35.C
【详解】考查状语从句。句意:只要有足够的水分、食物和必要的土壤条件,蚯蚓就会出现。A. however无论如何;B. and并且;C. wherever无论在哪里;D. but但是。此处为地点状语从句,表示“无论哪里”用wherever。故选C。
36.C
【详解】考查连词辨析。句意:既然每个人的手机都能拍出专业品质的照片,更多的人正在通过视觉故事分享他们的生活。A. In case万一,以防;B. In order that为了;C. Now that既然,由于;D. As if好像。“everyone’s cellphone can take professional-quality photos”是“more people are sharing their lives through visual storytelling”的原因,即因为手机能拍出专业品质的照片,所以更多人通过视觉故事分享生活,用now that引导原因状语从句。故选C项。
37.A
【详解】考查原因状语从句引导词。句意:既然你在这儿,你可以帮我打扫卫生。as由于;if如果;unless除非;when当……时候。as表“由于”,引导原因状语从句,符合语境,故选A。
38.C
【详解】考查原因状语从句。句意:我今晚不能去参加派对了,因为我得工作到很晚。A. though尽管;B. while当……时;C. as因为;D. once一……就……。结合“I have to work late”可知,“得工作到很晚”是“不能去派对”的原因,空格处应表达 “因为”,用as引导原因状语从句。故选C。
39.C
【详解】考查强调句型和原因状语从句。句意:正是因为劳拉在网上发布了一些虚假信息,她才被逮捕的。根据“It was”和“she was arrested”可知,强调句型“it be+被强调部分+that…”符合题意,“Laura posted some false information on the Internet (劳拉在网上发布了一些虚假信息)”是“她被逮捕”的原因,因此用because引导原因状语从句,整个句子强调该状语。故选C。
40.C
【详解】考查连词短语辨析。句意:鉴于世博会的主题是促进丝绸之路沿线国家的文化交流和加强相互合作,敦煌是理想之地。A. Provided that倘若、假如;B. So that以便、为了;C. Given that鉴于、考虑到;D. In order that为了。由语意可知,“世博会主题是促进丝路国家文化交流与合作”是“敦煌成为理想举办地”的前提和原因,Given that引导原因状语从句,符合语境,引出既定事实作为依据。故选C项。
41.A
【详解】考查状语从句连接词。句意:既然你在这里,可以帮我做家务。A. Now that 既然(引导原因状语从句);B. Because of 因为(后接名词、代词或动名词);C. As for 至于(后接名词、代词或动名词);D. Even if 即使(引导让步状语从句)。由语意可知,此处需填入表示“既然”的连接词,引导原因状语从句,强调“你在这里”这一既定事实。故选A。
42.A
【详解】考查连词词义辨析。句意:——露西昨天为什么没去上学?——因为她不舒服。A. Because 因为;B. But 但是;C. If 如果;D. When 当……时。根据问句用“why(为什么)”询问原因可知,回答需用表示因果关系的连词“because”。故选A项。
43.D
【详解】考查连词词义辨析。句意:Tom吃完了所有的蛋糕, 因为他很饿。A. until直到;B. if如果;C. or或者;D. because因为。根据句意可知,“he was very hungry”是前文“Tom ate all the cakes ”的原因,故应用because引导原因状语从句,故选D。
44.A
【详解】考查连词辨析。句意:中国武术模仿动物的动作,因为他们钦佩动物的天生能力。A. because因为;B. though尽管;C. until直到;D. if如果。根据语境可知,“他们钦佩动物的天生能力”是“中国武术模仿动物的动作”的原因,所以应用从属连词because引导原因状语从句。故选A项。
45.D
【详解】考查连词词义辨析。句意:由于科技使交流变得更快、更容易,人们可以与远方的亲人保持联系。A. Until直到;B. Unless除非;C. Although尽管;虽然;D. Since因为;自从。由句意及空后的technology makes communication faster and easier, people can stay connected with loved ones from afar可知人们可以与远方的亲人保持联系的原因是因为科技使交流变得更快、更容易了,此处为原因状语从句,应用引导词since,故选D项。
46.B
【详解】考查连词辨析。句意:玛丽昨天没有参加会议,因为她生病了。A. if如果;B. because因为;C. though虽然;D. unless除非。由句意和she was ill可知,这里指玛丽没有参加会议是因为她生病了。故选B项。
47. while taking notes
【详解】考查连词和动词短语。根据句意和中文提示可知,表示“一边……一边……”应用while doing sth. 的结构(主句主语与分词逻辑主语一致时,可省略从句主语和be动词),“记笔记”为take notes,此处take用现在分词形式taking。故填while taking notes。
48.As time goes on
【详解】考查状语从句和时态。“随着时间的推移”作时间状语,用从属连词as引导从句,主语“时间”用名词time,谓语“推移”用动词短语go on,描述目前的情况,用一般现在时态,主语是不可数名词,谓语用单数形式goes on。故填As time goes on。
49.By the time he is 18 next year
【详解】考查时间状语从句。句意:明年他就18岁了,他将从浙江大学毕业。原句中“Next year he will be 18”改写为by the time引导的时间状语从句,主句“he will graduate from Zhejiang University.”为一般将来时,从句应用一般现在时表将来,主语he是第三人称单数,故谓语动词用is。故填By the time he is 18 next year。
50.Every time I pass the school
【详解】考查时间状语从句。句意:每次我经过学校时,我都想起了我的第一位英语老师。中英文对比可知空格处缺少“每次我经过学校时”;“每次”用every time引导时间状语从句,“经过学校”为pass the school,句子描述习惯性动作,用一般现在时,主语“我”为 I,谓语动词用原形 pass。故填Every time I pass the school。
51.Where
【详解】考查地点状语从句。根据句意以及句子要求提示可知,此处为连词Where表示“在……地方”引导的地点状语从句,“Where there is life”为 where 引导的地点状语从句,修饰主句 “there is hope”,表示“在有生命的地方,就有希望”,同时构成谚语“Where there is life, there is hope. (留得青山在,不怕没柴烧。)”。故填Where。
52.where there had once been a theatre
【详解】考查状语从句。空处表示“在以前的剧院处”,表示“在……处”用where引导地点状语从句,表示“以前的剧院处”可用there be句型,且表示过去的过去,故用过去完成时,翻译为there had once been a theatre。故填where there had once been a theatre。
53.Since
【详解】考查连词。根据英汉意思对比可知,空处应填表示“既然”含义的连词,用来引导原因状语从句。since有“既然;由于”的意思,可引导原因状语从句,符合语境,句首单词首字母大写,故填Since。
54.because
【详解】考查连词。根据英汉意思对比可知,空处应填表示“因为”含义的连词,用来引导原因状语从句,说明指导老师建议“我”报名高级文学的原因。because意为“因为”,是常用的引导原因状语从句的连词,符合语境,故填because。
55.Now that
【详解】考查连词。根据英汉意思对比可知,空处应填一个能表达“既然”含义、引导原因状语从句的连词。Now that意为“既然;由于”,用于说明一个已知的事实或情况,并以此为理由引出另一个陈述,符合此处语境,即因为“在地球上很难避免灾难”这个已知事实,所以引出“或许我应该开始思考移民去太空”的陈述,句首单词首字母大写,故填Now that。
56.for
【详解】考查原因状语从句。前后句意存在因果关系,表示“因为”用for引导原因状语从句。故填for。
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