题目内容
I sent invitations to 90 people, ____ have replied.
A. of whom only 30 of them B. of whom only 30
C. only 30 of those who D. only 30 who
B
名词/代词+of +关系代词(which/whom)常引导非限制性定语从句,of whom only 30 =only 30 of whom。
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