问题描述：
一道高中英语题please put the books where they were
please put the books_____-they were
A where B.in which
为什么选where .不能选B.? where不是等于in which 么
please put the books_____-they were
A where B.in which
为什么选where .不能选B.? where不是等于in which 么
问题解答：
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