问题
选择题
There are a great many books in the store, _____ some are useful to us. [ ]
A. of them
B. in which
C. of which
D. in them
答案
答案：C
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There are a great many books in the store, _____ some are useful to us. [ ]
A. of them
B. in which
C. of which
D. in them
答案：C