本资料来自于资源最齐全的２１世纪教育网www.21cnjy.com
1．(2014·安徽省合肥市高三第三次教 ( http: / / www.21cnjy.com )学质量检测)We stayed at the Park Hotel last weekend， ______ a friend of ours recommended to us.
A．when B．that
C．where D．which
解析 本题考查的是定语从句，关键在于要找出 ( http: / / www.21cnjy.com )这个定语从句的先行词，本句的先行词是the Park Hotel，在后面的定语从句，动词recommend后面缺宾语，所以使用关系代词which引导非限制性定语从句。不能使用that，因为that不能引导非限制性定语从句。句意：我们上个周末住在了the Park Hotel，这是我的一个朋友向我们推荐的。A、C项是关系副词，不能在句中做宾语。故D正确。
答案 D
2．(2014·北京市西城区高三5月二模试 ( http: / / www.21cnjy.com )题)Paris has some great museums ________ visitors can see fine works of impressionist painters.21*cnjy*com
A．where B．which
C．that D．when
解析 本题中的定语从句的先 ( http: / / www.21cnjy.com )行词是some great museums，后面定语从句visitors can see fine works of impressionist painters的主谓宾的句子结构很完整，所以使用关系副词来引导，因为先行词是指地点的名词，所以使用where。句意：巴黎有很多在里面游客可以看到有名的画家的作品的博物馆。故A正确。
答案 A
3．(2014·山东日照市高三校际联合 ( http: / / www.21cnjy.com )检测)The movie is adapted from a novel，________ author I can't remember now.
A．which B．where
C．what D．whose
解析 本题定语从句的先行词是a n ( http: / / www.21cnjy.com )ovel，后面的定语从句author I can't remember now 中的名词author缺少定语修饰，使用whose在从句中作定语，修饰name，代指“小说的”。本句中的whose author＝the author of which；句意：这部电影是由一本小说改编而来的，我记不得这本小说的作者了。在定语从句中能做定语的关系代词只有whose。故D正确。
答案 D
4．(2014·湖南省怀化市高三第 ( http: / / www.21cnjy.com )二次模拟考试)For more information，please send an e mail，________ you can also include your advice to us.2-1-c-n-j-y
A．when B．where
C．which D．that
解析 本题定语从句的先行词是an e mai ( http: / / www.21cnjy.com )l，后面的定语从句you can also include your advice to us句子结构很完整，所以使用关系副词where来引导，有时候where的先行词并不一定需要是表示地点的名词。句意：需要更多信息，请给我发邮件，在邮件里你可以把你给我们的建议也写上去。when的先行词必须是表示时间的名词。C、D是关系代词，在句中不能做状语。故B正确。21世纪教育网版权所有
答案 B
5．(2014·福州市高三 ( http: / / www.21cnjy.com )适应性练习)The following original editions of discs are imported from Hong Kong and Taiwan，________ prices include the transportation costs.21cnjy.com
A．what B．which
C．where D．whose
解析 本题定语从句的先行 ( http: / / www.21cnjy.com )词是original editions of discs，在定语从句中关系代词whose指代先行词，放在名词prices的前面做定语。句意：下面的磁盘的最初版是从香港和台湾来的，它们的价格包括了运输的费用。A项不能引导定语从句，B、C两项在定语从句中通常不做定语。故D正确。
答案 D
6．(2014·(春)重庆市高三考前冲 ( http: / / www.21cnjy.com )刺测试卷)The more you like yourself，the less you are like anyone else，________ makes you unique.
A．which B．that
C．as D．when
解析 本题定语从句的先行词是前面一句话 ( http: / / www.21cnjy.com )的内容，which指代前面一句话的内容在后面句中做主语。句意：你越喜欢你自己，你就越不喜欢别人，这会让你很独特。that不能引导非限制性定语从句，when在定语从句中不能做主语，只能做状语。as引导非限制性定语从句，有正如的意思。故A正确。
答案 A
7．(2014·天津市河东区高三二 ( http: / / www.21cnjy.com )模考试)Jim wanted to keep fit，so he spent as much time as he ________ exercise.2·1·c·n·j·y
A．could taking B．took
C．to take D．could take
解析 本题中含有一个定语从句as he ( http: / / www.21cnjy.com )could(spend)，先行词是as much time，关系代词as指代先行词做动词spend(承前省略)的宾语。另外本句中还考查了spend some time (in) doing sth花费时间做某事；句意：Jim想要保持健康，于是他把尽可能多的时间都花在了参加体育锻炼上。故A正确。
答案 A
8．(2014·天津市河东区高三二模 ( http: / / www.21cnjy.com )考试)What he said brought the hours back to me ________ I was taken good care of in that far away village.21教育名师原创作品
A．until B．that
C．when D．where
解析 本题定语从句的先行词和定语从句之 ( http: / / www.21cnjy.com )间间隔了介词短语back to me；先行词是the hours，后面的定语从句when I was taken good care of in that far away village的句子结构很完整，所以使用关系副词when来引导这个定语从句。句意：他说的话让我想起了在那个遥远的村子里被照顾得很好的时间。故C正确。
答案 C
9．(2014·重庆一中高三下 ( http: / / www.21cnjy.com )第三次月考)There are many smokers in China，________ the number of students who pick up this habit ________ increased a lot.
A．where；has B．which；has
C．where；have D．as；have
解析 本题第一空考查的是定语从句，先行 ( http: / / www.21cnjy.com )词是China，后面的定语从句句子结构很完整，所以使用关系副词where来引导这个定语从句。第二空是定语从句的谓语动词，因为主语是the number of...该结构做主语的时候，谓语动词使用单数形式。故A正确。
答案 A
10．(2014·山东省实验中学高三第二次 ( http: / / www.21cnjy.com )模拟考试)Lily took a few friends to my birthday party，none of ________ I was familiar with.
A．which B．whose
C．that D．whom
解析 本题的关键是找准先行词 ( http: / / www.21cnjy.com )a few friends，在定语从句中使用whom指代先行词，并作为介词of的宾语。which的先行词不能是人；that不能放在介词的后面，whose在定语从句中做定语，后面要有名词。句意：Lily带了一些朋友来参加我的生日聚会，他们中我一个也不熟悉。故D正确。
答案 D
11．(2014届江西省重点中学盟校高 ( http: / / www.21cnjy.com )三第二次联考英语试卷)He wrote a long letter ________ he explained what had happened in the accident.
A．what B．which
C．where D．how
解析 本题是一个定语从句，先行词是a ( http: / / www.21cnjy.com )long letter，后面的定语从句he explained what had happened in the accident的句子结构很完整，所以使用关系副词引导这个定语从句，选项里只有where是关系副词。句意：他写了一封很长的信，在信里，他解释了事故里所发生的事情。故C正确。
答案 C
12．(2014届青岛统一质检)The ( http: / / www.21cnjy.com )result was not the same as they had expected，________ was rather disappointing.
A．that B．which
C．when D．what
解析 考查定语从句。所填词引导非限制性定语从句，先行词指代前面整个主句，关系词在从句中作主语，应用which来引导定语从句。故选B。
答案 B
13．(2014届安徽省宿松县程集中学高三上 ( http: / / www.21cnjy.com )学期期中)We all like the way ________ the teacher gives his lessons.
A．which B．that
C．what D．how
解析 考查the way 引导定语从 ( http: / / www.21cnjy.com )句。句意：我们都很喜欢老师上课的方式。当the way 做先行词时，如果定语从句不缺主干成分，用 that ，in which 或者省略。如果定语从句缺少主语或者宾语，用that /which 引导。the teacher gives his lessons不缺主干成分，故选B项。【版权所有：21教育】
答案 B
14．(2014届山东省德州市重点中学 ( http: / / www.21cnjy.com )高三上学期期中)________ is recorded in the history book，Diaoyu Island has belonged to China since ancient times.
A．As B．That
C．Which D．What
解析 考查定语从句。本句考查的是非限制性 ( http: / / www.21cnjy.com )定语从句，that不能引导非限制性定语从句。which引导的非限制性定语从句不能放在句首。what不能引导定语从句。as可以指代一句话的内容，引导非限制性定语从句，放在句首，表示“正如……”；句意：正如这本历史书里所记录那样，自古以来钓鱼岛就属于中国。故选A项。
答案 A
15．(2014届山东师大附中高三 ( http: / / www.21cnjy.com )第三次模拟)In our class there are 46 students，________ half wear glasses.
A．in whom B．in them
C．of whom D．of them
解析 考查定语从句。句意：在我们班有 ( http: / / www.21cnjy.com )46个学生，一半学生戴眼镜。通过分析句子结构，可知这个句子中包含一个非限制性定语从句，表示“……中”用of，选C项。
答案 C
16．(2014届浙江省衢州一中高三上 ( http: / / www.21cnjy.com )学期期中)A housing bubble is an economic situation ________ occurs when house prices rise much too fast.
A．which B．where
C．what D．why
解析 考查定语从句。句意：房 ( http: / / www.21cnjy.com )产泡沫是一个经济形势，这种形式发生在房价上涨太快的时候。本题定语从句的先行词是an economic situation，后面的定语从句中缺少主语，故使用which指代先行词，在句中做主语。B、D只能在定语从句做状语。what不能引导定语从句。故选A项。
答案 A
17．(2014届北京市朝 ( http: / / www.21cnjy.com )阳区高三上学期期中)I'm going to spend the winter vacation in Shanghai，________ I have relatives.
A．which B．that
C．where D．when
解析 考查定语从句。句意：我要到上海过寒假 ( http: / / www.21cnjy.com )，那里我有亲戚。先行词是Shanghai，定语从句中不缺主宾表，缺少的是地点状语，用where引导定语从句，选C项。21教育网
答案 C
18．(2014届福建省厦门一中高三上学期期 ( http: / / www.21cnjy.com )中)Have you bought the same book ________ I referred to yesterday 【来源：21·世纪·教育·网】
A．that B．as
C．which D．what
解析 考查定语从句。句意：你买了我昨天指的那 ( http: / / www.21cnjy.com )本同样的书么？the same...as...和……一样，句中as引导定语从句，在从句中作宾语。故选B项。
答案 B
19．(2014届黑龙江省大 ( http: / / www.21cnjy.com )庆铁人中学高三上学期期中)When deeply absorbed in work，________ he often was，he would forget all about eating or sleeping.
A．that B．which
C．where D．when
解析 考查非限制性定语从句。句意 ( http: / / www.21cnjy.com )：当他沉浸在工作中的时候，他常常会忘记吃饭睡觉，这是常有的事情。本题中的which指代前面deeply absorbed in work，在句中作为系动词was后面的表语。that不能引导非限制性定语从句。C、D两项是关系副词在句中只能做状语，不能做表语。故选B项。
答案 B
20．(2014届浙江省温州市十校联合体高 ( http: / / www.21cnjy.com )三上学期期中联考)Parents should pay attention to the cases ________ their children have difficulty adapting to new surroundings.www.21-cn-jy.com
A．where B．as
C．why D．when
解析 考查定语从句。句意：父母应该注意 ( http: / / www.21cnjy.com )这样的情况，孩子们对适应新的环境有困难。先行词是the cases，定语从句中缺少地点状语，用where引导定语从句，选A项。21·世纪*教育网
答案 A
Ⅰ.根据上下文和括号中的提示，用定语从句完成句子
In our school，the ( http: / / www.21cnjy.com )re are various kinds of activities，1.________________(我们非常喜欢它们)．Playing football and reading stories are my favorites 2.________________(它们对我有许多好处)．Besides building my body and enriching my knowledge，they also free me from the heavy work or study.
From my point of ( http: / / www.21cnjy.com ) view，if there is an activity 3.________________(是你感兴趣并适合你)，you should participate in it,4.________________(它不仅能使你的学校生活丰富多彩，还能提高你的交际能力)．www-2-1-cnjy-com
答案 1.which we enjoy ( http: / / www.21cnjy.com ) very much 2.which do me lots of good 3.which interests and suits you 4.which will not only enrich your school life，but also improve your ability to communicate with others【出处：21教育名师】
Ⅱ.完成句子
1．—How do you like the book
—It's quite different from the one ________(我上周读的那本)．
2．—Do you have anything to say for yourselves
—Yes，there is one point________ (我们必须坚持)．
3．—Where did you have the discussion with Professor Snow
—It was in the classroom________(我们昨天上生物课) .
4．Soon children i ( http: / / www.21cnjy.com )n the camp had many new friends，______ (他们分享食物)，stories，and projects.【来源：21cnj*y.co*m】
5．________ (正如报告所显 ( http: / / www.21cnjy.com )示的那样)，teenager problems are often connected with family life education.
6．The road construc ( http: / / www.21cnjy.com )tion is based on the agreement，______ (它的一个目标) is to ensure its completion on time.
7．Meizhou Is ( http: / / www.21cnjy.com )land is such a beautiful place of interest ________ (每一个人都喜欢参观的)．21·cn·jy·com
8．________(我们众所周知 ( http: / / www.21cnjy.com ))，our government has spared no efforts to control food prices.
9．Gone are the days________ (我们一起度过的) in the mountainous village.
10．With the ( http: / / www.21cnjy.com )development of agriculture，the people______ (在他们的村庄) I taught are now living a happy life.
答案 1.that/which I ( http: / / www.21cnjy.com ) read last week 2.that/which we must insist on 3.where we had a biology lesson yesterday
4．with whom they shared food 5.As is shown in the report
6．one of whose p ( http: / / www.21cnjy.com )urposes 7.as every one likes to visit 8.As is known to us 9.when we spent together 10.in whose village 21*cnjy*com
21世纪教育网 -- 中国最大型、最专业的中小学教育资源门户网站。 版权所有@21世纪教育网(共39张PPT)
【考向聚焦】
定语从句是高考的热点，主要考查关系代词和关系副词的正确运用，特别是它们在非限制性定语从句中的运用。主要考点有：
①关系代词which引导的非限制性定语从句；
②关系副词where引导的定语从句(近三年来常考查先行词是表示抽象空间概念的名词的情况)；
③“介词＋关系代词”引导的非限制性定语从句；
④as引导的非限制性定语从句。
1．(2014·安徽，22)The exact year ________ Angela and her family spent together in China was 2008.
A．when B．where
C．why D．which
解析 考查定语从句。句意：Angela和她的家人一起呆在中国的那一年是2008年。先行词the exact year在定语从句中作spent的宾语且指物，故选D。which(也可用that或省略)。
答案 D
2．(2014·北京，26)I borrowed the book Sherlock Holmes from the library last week，________ my classmates recommended to me.
A．who B．which
C．when D．where
解析 考查定语从句。句意：上个星期，我从图书馆借了同学给我推荐的《大侦探福尔摩斯》。此处考查非限制性定语从句，先行词the book在定语从句中作recommend的宾语，所以要用关系代词，先行词是物，故选which。
答案 B
3．(2014·福建，31)Students should involve themselves in community activities ________ they can gain experience for growth.
A．who B．when
C．which D．where
解析 考查定语从句。句意：学生应该潜心于社区活动之中，在这些活动中，他们可以获取成长的经验。在定语从句中缺少地点状语，故选D项。
答案 D
4．(2014·湖南，31)I am looking forward to the day ______ my daughter can read this book and know my feelings for her.
A．as B．why
C．when D．where
解析 考查定语从句的引导词。句意：我正盼望着我女儿能读这本书并知道我对她的感受的那一天。先行词the day在从句中做时间状语，故用关系副词when，选C。
答案 C
5．(2014·江苏，22)The book has helped me greatly in my daily communication，especially at work ________ a good impression is a must.
A．which B．when
C．as D．where
解析 考查定语从句的引导词。句意：这本书在我的日常交流中帮了很大的忙，尤其是在良好印象是一项必要条件的工作中。根据句式结构该定语从句中work是先行词，指事物，在从句中作抽象概念的地点状语，用where故选D。
答案 D
6．(2014·江西，28)Among the many dangers ________ sailors have to face，probably the greatest of all is fog.
A．which B．what
C．where D．when
解析 考查定语从句。题干意思是“在水手面临的众多危险中，最大的危险可能是大雾天气。”定语从句中谓语动词face后缺少宾语，应当用关系代词，由此可排除C、D两项。因为what不可引导定语从句，故答案非A莫属。
答案 A
7．(2014·山东，10)A company ________ profits from home markets are declining may seek opportunities abroad.
A．which B．whose
C．who D．why
解析 考查定语从句。句意：利润来源于国内市场且在下降的公司可以到国外寻找机会。此处关系代词whose作定语，故选B项。
答案 B
8．(2014·陕西，13)Please send us all the information ________ you have about the candidate for the position.
A．that B．which
C．as D．what
解析 考查定语从句。句意：请把所有有关这个职位候选人的信息发给我们。首先排除D项，因为what不是定语从句的引导词，而是名词性从句的引导词；先行词information在定语从句中充当动词have的宾语，前面又有all来修饰，故只能用that；不用which；as用在定语从句中常和such，the same连用。
答案 A
9．(2014·陕西，15)________ the delayed flight will take off depends much on the weather.
A．Why B．When
C．That D．What
解析 考查主语从句。句意：延误的航班什么时候起飞很大程度上取决于天气。由于从句完整，不缺成分，首先排除D.what；根据句意，需要时间概念when，而不是A why原因；B.that没有意义，也不充当成分。
答案 B
10．(2014·四川，4)Until now，we have raised 50,000 pounds for the poor children，________ is quite unexpected.
A．that B．which
C．who D．it
解析 考查定语从句关系词的用法。显然这是一个非限制性定语从句。句意：到目前为止我们已经为贫困儿童筹集了5万英镑，这是我们始料未及的。which指代整个主句。
答案 B
11．(2014·天津，12)English is a language shared by several diverse cultures，________ uses it differently.
A．all of which B．each of which
C．all of them D．each of them
解析 考查非限制性定语从句。句意：英语是一种由多种文化共享的语言，每一种语言对其使用都是不同的。根据结构判断该定语从句的先行词是several diverse cultures，是物，作介词of的宾语，用which；根据从句中谓语动词是单数形式uses，排除A，选B。
答案 B
12．(2014·浙江，5)I didn't become a serious climber until the fifth grade，________ I went up to rescue a kite that was stuck in the branches of a tree.
A．when B．where
C．which D．why
解析 考查定语从句。句意：直到五年级，我才真正会爬树，当时，我爬上一棵树，拿下了挂在树枝上的风筝。后面的定语从句是完整的句子，首先排除C项；先行词为the fifth grade，表时间概念，所以选A。
答案 A
13．(2014·重庆，9)We'll reach the sales targets in a month ________ we set at the beginning of the year.
A．which B．where
C．when D．what
解析 考查定语从句。句意：一个月之后我们就能完成年初制定的销售目标。先行词targets在从句中作set的宾语，故要用关系代词。
答案 A
14．(2013·安徽，29)Mo Yan was awarded the Nobel Prize for Literature in 2012，________ made one of the Chinese people's long held dreams come true.
A．it B．that
C．what D．which
解析 考查定语从句。句意：2012年莫言被授予诺贝尔文学奖，这使得中国人民多年以来的一个梦想实现了。本题考查非限制性定语从句，先行词是前面整句话的内容，关系代词which在从句中作主语，that不能引导非限制性定语从句。
答案 D
15．(2013·江苏，32)The president of the World Bank says he has a passion for China，________ he remembers starting as early as his childhood.
A．where B．which
C．what D．when
解析 考查定语从句。句意：世界银行的总裁说他热爱中国，这种热爱早在他的童年时代就开始了。此句中passion(热爱，激情)为先行词，在定语从句中starting之后缺少宾语，因此排除A、D两项，when和where为关系副词，不能充当主语或宾语。C项的what不能引导定语从句，故选B。
答案 B
16．(2013·福建，27)The book tell stories of the earthquake through the eyes of those ________ lives were affected.
A．whose B．that
C．who D．which
解析 句意：这本书通过那些生活受到影响的人的视角讲述了地震的故事。根据题干可知空格后部分是定语从句，先行词是代词those，表示“那些人”，而定语从句中缺少定语成分，故选A项，whose在从句中作定语。关系代词that，who和which在定语从句中只能作主语或宾语。
答案 A
17．(2013·山东，35)Finally he reached a lonely island ________ was completely cut off from the outside world.
A．when B．where
C．which D．whom
解析 考查定语从句。句意：最后他到达了一个完全与外界隔绝的孤岛。island后面是一个定语从句，修饰island，并且从句中缺少主语，同时指物，所以选C。而A项when及B项where在定语从句中分别作时间及地点状语；D项whom只能指人，在定语从句中作宾语。
答案 C
18．(2013·浙江，5)The children，________ had played the whole day long，were worn out.
A．all of what B．all of which
C．all of them D．all of whom
解析 考查定语从句。句意：孩子们都累了，他们都玩了一整天。该定语从句的先行词为children，定语从句的引导词在从句中作介词of的宾语，只能用whom。故选D。
答案 D
19．(2013·浙江，13)The museum will open in the spring with an exhibition and a viewing platform ________ visitors can watch the big glasshouses being built.
A．what B．where
C．when D．why
解析 考查定语从句。句意：博物馆将于春天开放，届时将有一个展览，还将有一个看台，在看台上游客可以看到正在建设中的大玻璃房子。该空引导定语从句，先行词为platform，该空在从句中作地点状语，只能用where。故选B。
答案 B
20．(2013·四川，9)Nowadays people are more concerned about the environment ________ they live.
A．what B．which
C．when D．where
解析 考查定语从句。句意：目前人们更加关心他们所居住的环境。A项可引导名词性从句；B项可引导定语从句，在从句中可作主语、宾语；C项可引导定语从句，在句中作时间状语；D项可引导定语从句，在句中作地点状语。从句中的live为不及物动词，先行词the environment在定语从句中作地点状语，故选D项。
答案 D
考点 关系代词引导的定语从句
1．who，whom，that这些词代替的先行词是表示人的名词或代词，在从句中可作主语、宾语等，其中whom只能作宾语。
Ellen was a painter of birds and of nature，who，for some reason，had withdrawn from all human society.
埃伦是一个画鸟类和自然的画家，出于某种原因，他已退出了所有的社会活动。
2．which，that所代替的先行词是表示事物的名词或代词，在从句中可作主语、宾语等。
You'll find taxis waiting at the bus station which you can hire to reach your host family.
在公共汽车站你会发现有出租车在那里等，你可以租(一辆) 去主人家里。
The old town has narrow streets and small houses that are built close to each other.
这座古老的城镇街道狭窄，小房子挨得很近。
3．whose用来指人或物，在定语从句中只作定语。
Children who are not active or whose diet is high in fat will gain weight quickly.
很少进行体育锻炼或饮食富含脂肪的孩子体重会增加很快。
The school shop，whose customers are mainly students，is closed for the holidays.
这家校内商店放假时关门，它的顾客主要是学生。
考点 关系副词引导的定语从句
1．关系副词when，where，why的先行词是表示时间、地点或理由的名词，在从句中作状语。
The reason why I don’ trust him is that he often tells lies.
我不信任他的原因是他常常撒谎。
[名师指津] (1)当先行词为一些表示抽象地点的名词，如：point，situation，case，stage等，如果引导词在从句中作状语，常用关系副词where引导定语从句；如果不作状语，则用关系代词that/which。
Remember that there is still one point which we must make clear at the conference tomorrow.
记住在明天的会议上我们还有一点必须弄清楚。
She's in a hopeless situation，where we will keep a very close eye on her.
她处于无望的处境中，在这种情况下我们将密切注意她。
(2)先行词为occasions，当“时机”讲时，用关系副词when；当“场合”讲时，用关系副词where。
Occasions are quite rare when I have the time to spend a day with my kids.
我有时间陪我的孩子们一天的机会很少。
2．the way后面的定语从句的关系词。
在定语从句中，the way是一个比较特殊的先行词，当它在从句中充当方式状语时，其后的关系词可以是in which，that或省略；但是当它在从句中充当主语、宾语成分时，其后的关系词就用that或which。
The way (that/which) I thought of to solve this problem proves to be practical.
我想到的解决这个问题的方法证明是可行的。(先行词作宾语)
I don't like the way (that/in which) you solve the problem.
我不喜欢你解决问题的方法。(先行词作方式状语)
考点 “介词＋关系代词”引导的定语从句
1．“介词＋关系代词”中的关系代词只有whom(指人)，which(指物) 和whose三个。
Julie was good at German，French and Russian，all of which she spoke fluently.
Julie擅长德语、法语和俄语，所有的(三门语言) 她都说得很流利。
2．“复合介词短语＋关系代词”引导的定语从句常与先行词用逗号分开，定语从句常用倒装语序。
He lived in a big house，in front of which stood a big tree.
他住在一个大房子里，房子前面有一棵大树。
3．“of＋which/whom”表示所属关系。(表所属关系也可用whose)
She showed the visitors around the museum，the construction of which had taken more than three years.
她带着游客参观这座博物馆——花了三年多才建成的建筑。
[名师指津] 该考点考查的重点在于“用不用介词”和“用什么介词”。因此在答题时我们必须注意解题思路。可采用“先行词还原法”将先行词还原到从句中来确定正确的介词，具体做法是：
(1)把先行词放在从句中，从句子的意思来判断用不用介词和用什么介词。
He was the man from whose room the thief had stolen the bag.
他就是被小偷从其房间偷走包的那个人。(从他的房间里应用介词from)
(2)注意从句中动词、形容词、名词与介词的固定搭配。
In the dark street，there wasn't a single person to whom she could turn for help.
在漆黑的大街上没有一个人能为她提供帮助。(to与从句谓语动词构成搭配，turn to“求助于”)
考点 as和which引导的定语从句
1．as引导的限制性定语从句
用在the same...as，such...as，as...as，so...as结构中，as可以作主语、宾语或表语，可以用来代替先行词是表示人或物的名词。
They could only read such stories as had been rewritten in simple English.
他们只能读类似这样的一些用简易英语改写的故事。(as作主语)
These houses are sold at such a low price as people expected.
这些房子以人们期望的低价出售。(as作宾语)
2．关系代词as，which引导非限制性定语从句的区别
(1)as引导的非限制性定语从句，既可在主句前，又可在主句后，有时还可插入主句中，而which引导的非限制性定语从句只能置于主句之后。
After graduating from college，I took some time off to go travelling，which turned out to be a wise decision.
大学毕业后我抽出一部分时间去旅游，事实证明这是一个明智的选择。
(2)当非限制性定语从句放在主句前面时，只能用as。注意此时与名词性从句的互换。
As is known to everybody，the moon travels round the earth once every month.
＝ It is known to everybody that the moon travels round the earth once every month.(名词性从句)
＝ What is known to everybody is that the moon travels round the earth once every month.(名词性从句)
众所周知，月球每月绕地球转一圈。
(3)as意为“正如……”，后面的谓语动词多是see，know，expect，say，mention，report，announce等；which意为“这一点”。
The air quality in the city，as is shown in the report，has improved over the past two months.
正如报告中所表明的，城市空气质量在过去两个月里已经得到改善。
