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I sent invitations to 60 people,______have replied.A.of whom

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I sent invitations to 60 people,______have replied.A.of whom only 20 B.only 20 of these who
好的一定加分
如果不用从句的话此句可转换为 i sent invitation to 60 people.only 20 of them have replied.
在这里whom是代替of 后面的them.此句中间是逗号,明显,后面应为从句,如果硬要选B,则应该为:i sent invitation to 60 people.but only 20 of these peole have replied.
若选B,那么后面的句子only 20 of these( who have replied).就是定语从句,此句既是一个不完整的句子,只有主语20 of these,和定语who从句,没有谓语了.