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5. This machine, ______for many years, is still working perfectly.
A. after which I have looked
B. which I have looked after
C. that I have looked after
D. I have looked after
答案：B. which I have looked after 构成一个非限制性定语从句。
6. The reason ______he didn't come was ______he was ill.
A. why; that
B. that; why
C. for that; that
D. for which; what
答案：A. The reason why… was that….已成为一种固定句型，这一句中的why和that不能随意换位，也不能将that改成because，尽管that这个词在译文中可能有“因为”的含义。
7.He is working hard, ______will make him pass the final exam.
A. that
B. which
C. for which
D. who
答案：B. 非限制性定语从句常用which引导，which表示前句话的整个含义。
8. That is not the way ______I do it.
A. /
B. which
C. for which
D. with which
答案：A.
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