21. Everything_______can be done has been done.
A. which
B. that
C. what
D. it
答:B。先行词为不定代词,关系代词用that,不用which.
22. Such a film _______ was shown in the cinema yesterday is not popalar with chil-dren.
A. that
B. which
C. as
D. what
答:C。as引导的是定语从句。
23. When you read the book, you’d better make a mark ___________you have any ques-tions.
A. at which
B. at where
C. the place where
D. where
答:D。where引导的是状语从句,因mark(标记)不是指地点,不是先行词,若选C项,在theplace前应有介词at。
24. All ______ is needed is a supply of oil.
A. which
B. what
C. whatever
D. that
答:D.先行词是不定代词,关系代词用that。
25. He paid the boy $10 for washing ten windows, most of ________ hadn’t been cleaned for at least a year.
A. these
B. those
C. that
D. which
答:D.为非限制性的定语从句,又为介词放在关系代词前的用法。
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