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1. 考查which引導(dǎo)的非限制性定語(yǔ)從句
which引導(dǎo)非限制性定語(yǔ)從句，用以指代整個(gè)主句的內(nèi)容，或主句中某個(gè)詞或短語(yǔ)的內(nèi)容。如：
(1) By serving others, a person focuses on someone other than himself or herself, _______ can be very eye-opening and rewarding.
A. who B. which C. what D. that
答案為B。which在此引導(dǎo)非限制性定語(yǔ)從句，which在定語(yǔ)從句中用作主語(yǔ)，表示前面所提到的情況。
(2) Chan’s restaurant on Baker Street, _______ used to be poorly run, is now a successful business.
A. that B. which C. who D. where
答案為B。which used to be poorly run為非限制性定語(yǔ)從句，其中的which指代前面的China’s restaurant。
2. 考查as引導(dǎo)的非限制性定語(yǔ)從句
as也可指代整個(gè)主句的內(nèi)容，但不同于which的是，它引導(dǎo)的定語(yǔ)從句既可以位于主句的前面，也可以位于主句的后面。它的意思是“正如”，在這些從句中as 作主語(yǔ)或賓語(yǔ)。如：
(1) _______ I explained on the phone, your request will be considered at the next meeting.
A. When B. After C. As D. Since
答案為。as 引導(dǎo)定語(yǔ)從句，其意為“正如”。
(2) _______ is often the case, we have worked out the production plan.
A. Which B. When C. What D. As
答案為D。解析：引導(dǎo)非限制性定語(yǔ)從句且位于主句之前，用as引導(dǎo)。答案分別為CBD。
3. 考查由“介詞＋關(guān)系代詞”引導(dǎo)的定語(yǔ)從句
“介詞+關(guān)系代詞”結(jié)構(gòu)中的關(guān)系代詞主要是which或whom，不能是that；其中的介詞則要根據(jù)句子中的相關(guān)搭配來確定。如：
(1) He was educated at the local high school, _______ he went on to Beijing University.
A. after which B. after that C. in which D. in that
答案為A。after which中的which指“他在當(dāng)?shù)匾凰咧薪邮芙逃保?a href="/3-113" title="adv.以后；后來conj.在...以后prep.在...之后；在后面；關(guān)于；追趕；依照adj.以后的" target="_blank">after which的意思就是“在當(dāng)?shù)匾凰咧薪邮芡杲逃?即高中畢業(yè)之后)”。
(2) She was educated at Beijing University, _______ she went on to have her advanced study abroad.
A. after which B. from which C. from that D. after that
答案為A。after which在此引導(dǎo)非限制性定語(yǔ)從句，相當(dāng)于and after that。又如：This I did at nine o’clock, after which I sat reading the paper. 九點(diǎn)時(shí)我做這件事，之后我就坐在那里看報(bào)。