问题描述：
2道英语题
1.There are fifty students in our class,____ are girls.
A.twenty of us B.twenty of whom C.twenty of them
(答案是B,为什么不是C?)
2.有一句话:Our neighbor's house is of the same size as ours(为什么加of）
1.There are fifty students in our class,____ are girls.
A.twenty of us B.twenty of whom C.twenty of them
(答案是B,为什么不是C?)
2.有一句话:Our neighbor's house is of the same size as ours(为什么加of）
问题解答：
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