01. Have you been to the restaurant ______ is just opened in town?
A. what B. that C. when D. why
02. There are lots of things ______ I need to buy before the trip.
A. whom B. that C. when D. why
03. He might have left the money for the simple reason ______ he didn’t know it was there.
A. that B. which C. why D. what
04. The baby is due in May, by ______ the new house should be finished.
A. that B. why C. which D. when
05. That was written in 1946, since ______ the education system has undergone great changes.
A. that B. why C. which D. when
06. She remembered the day ______ Paula had first walked into her office.
A. which B. that C. when D. why
07. Sunday is the only day ______ I can relax.
A. which B. that C. when D. why
08. There are times ______ I wonder why I do this job.
A. which B. that C. what D. when
09. The last time I went to
A. which B. what C. why D. when
10. You know that little Italian restaurant―the one ______ I mentioned in my letter?
A. which B. when C. what D. where
11. Look, now we are driving by the houses ______ Andy has described.
A. which B. when C. what D. where
12. The house, ______ was completed in 1856, was famous for its huge marble staircase.
A. that B. which C. what D. where
13. One of the boys kept laughing, ______ annoyed Jane intensely.
A. that B. which C. what D. where
14. His best movie, ______ won several awards, was about the life of Gandhi.
A. that B. when C. what D. which
15. It was a crisis ______ she was totally unprepared.
A. on what B. on which C. for which D. for what
16. The train, ______ takes only two hours to get there, is quicker than the bus, _____ takes three.
A. which, it B. it, which C. which, which D. it, it
17. The higher the interest rate, the greater the financial risk, ______, of course, cuts both ways.
A. that B. it C. which D. what
18. Mrs Smith, ______ has a lot of teaching experience at junior level, will be joining the school in September.
A. that B. which C. who D. what
19. And then Mary, ______ we had been talking about earlier, walked in.
A. that B. which C. who D. what
20. Which Mr Smith do you mean―the one ____ teaches history or the one ______ teaches music?
A. who, who B. which, which C. what, what D. he, he
21. My wife, ______ is out at the moment, will phone you when she gets back.
A. that B. which C. who D. what
22. Desperate for money, she called her sister, ______ she hadn’t spoken to in 20 years.
A. that B. which C. whom D. what
23. The reason ______ the injection needs repeating every year is that the virus changes. (www.yygrammar.com)
A. which B. why C. when D. where
【答案与解析】
注：有的讲解和分析比较“格式化”，目的是希望帮助同学们把握答题的“套路”，希望同学们能认真体会！
01. B。定语从句 ______ is just opened in town的句子结构不完整，句子缺主语，故可排除只能用作状语的C和D；而what不是关系词，不能引导定语从句，故可排除A。所以选B。
02. B。定语从句I need to buy before the trip的句子结构不完整，其中的动词buy缺宾语，故可排除只能用作状语的C和D；虽然关系代词whom和that均可用作宾语，但由于所修饰的先行词things指物不指人，故可排除只用于指人的whom。(www.yygrammar.com)
03. A。for the reason that 为固定表达，其意相当于because，其中的that不可换成which, why, what等。又如：We aren’t going for the simple reason that we can’t afford it. 我们不去原因很简单：我们负担不起。
04. D。that不能直接用于介词后引导定语从句，故可排除A；why引导定语从句，其先行词只能是the reason，故可排除B；由于先行词是表示时间的May，故用when不用which，by when的意思是“到那儿时”。
05. D。由于关系代词that不能直接用于介词后引导定语从句，故可排除A；而why引导定语从句，其先行词只能是the reason，故也被排除B；另外，由于先行词是表示时间的1946，故用when不用which。since when的意思是“从那时起”“从那以后”。又如：That was in 1949, since when things have been better. 那时是1949年，从那以后情况就好些了。
06. C。定语从句Paula had first walked into her office的句子结构是完整的，既不缺主语也不缺宾语，故可排除A和B；至于关系副词why，它引导定语从句时，其先行词只能是the reason，故可排除D；when在此引导定语从句，修饰名词day，表示时间。
07. C。由于定语从句I can relax的句子结构是完整的，不缺主语或宾语，故可排除A和B；why引导定语从句，其先行词只能是the reason，故可排除D；when在此引导定语从句，修饰名词day，表示时间。句意为：星期日是我唯一可以休息的日子。
08. D。由于定语从句I wonder why I do this job的句子结构是完整的，不缺主语或宾语，故可排除A和B；what不是关系词，不能引导定语从句，故可排除C；when在此引导定语从句，修饰名词times，表示时间。句意为：有时候我自己也不明白自己为什么要干这份工作。
09. D。由于定语从句the weather was beautiful的句子结构是完整的，不缺主语或宾语，故可排除A；what不是关系词，不能引导定语从句，故可排除B；why不可用于引导非限制性定语从句，故可排除C；when在此引导定语从句，修饰名词May，表示时间。句意为：我上次去苏格兰是五月份，那时天气很好。
10. A。由于定语从句I mentioned in my letter的句子结构不完整，其中的动词mention缺宾语，故可排除只用作状语的关系副词when和where；而what不是关系词，不能引导定语从句，故可排除C。which在此引导定语从句，修饰名词the one，在定语从句中用作宾语。
11. A。由于定语从句Andy has described的句子结构不完整，其中的动词describe缺宾语，故可排除只用作状语的关系副词when和where；而what不是关系词，不能引导定语从句，故可排除C。which在此引导定语从句，修饰名词the houses，在定语从句中用作宾语。
12. B。由于定语从句_____was completed in 1856的句子结构不完整，句子缺主语，故可排除只用作状语的关系副词where；而what不是关系词，不能引导定语从句，故可排除C；that不可用于引导非限制性定语从句，故可排除A；which在此引导非限制性定语从句，修饰名词the house，在定语从句中用作主语。
13. B。由于定语从句______ annoyed Jane intensely的句子结构不完整，句子缺主语，故可排除只用作状语的关系副词where；而what不是关系词，不能引导定语从句，故可排除C；that不可用于引导非限制性定语从句，故可排除A；which在此引导非限制性定语从句，并在定语从句中用作主语。
14. D。由于that不能引导非限制性定语从句，所以被排除；关系副词when不能用作主语，所以被排除；what不是关系词，不能引导定语从句，也被排除。which在此引导非限制性定语从句。
15. C。由于what不是关系代词，不能引导定语从句，所以被排除；又因为be (un)prepared习惯上与介词for搭配，表示“对……准备好（没准备好）”，所以选C。句意为：这是一场她完全没有防备的危机。
16. C。引导非限制性定语从句且指事物时，英语习惯上要用which。
17. C。引导非限制性定语从句且指事物时，要用关系代词which。注意句中的of course为插入成分，若拿掉则为：The higher the interest rate, the greater the financial risk, ______ cuts both ways.
18. C。当先行词指人时，要用who来引导定语从句，不能用which，故可排除B；而that虽然可用于指人，但不用于引导非限制性定语从句；至于what，它根本不是关系代词，不能引导定语从句。
19. C。当先行词指人时，要用who来引导定语从句，不能用which，故可排除B；而that虽然可用于指人，但不用于引导非限制性定语从句；至于what，它根本不是关系代词，不能引导定语从句。
20. A。当先行词指人时，要用who来引导定语从句，不能用which。而选项C和D均不是关系代词，不能引导定语从句。
21. C。当先行词指人时，要用who来引导定语从句，不能用which；而that虽然可用于指人，但不用于引导非限制性定语从句；至于what，它根本不是关系代词，不能引导定语从句。
22. C。that不可用于引导非限制性定语从句，故可排除A；which只用于指物，不用于指人，故可排除B；what不是关系词，不能引导定语从句，故可排除D；whom在此引导非限制性定语从句，修饰名词her sister。(www.yygrammar.com)
23. B。在reason后通常用why来引导定语从句，相当于for which，但在口语或非正式文体中也可换成that，或省略不用。句意为：每年需要重新注射的原因是这病毒经常变化。又如：She didn't tell me the reason why she refused the offer. 她没跟我讲她拒绝这项工作的原因。