问题描述：
I sent invitations to 20 people,——came.
A.of whom only 10 of these B.only 10 of these who
C.of whom only 10 D.only 10 who
分析下,
A.of whom only 10 of these B.only 10 of these who
C.of whom only 10 D.only 10 who
分析下,
问题解答：
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