题目内容
The professor has two sons, ________ are teaching in the same university.
[ ]
A.neither of them
B.either of them
C.both of them
D.both of whom
答案:D
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题目内容
The professor has two sons, ________ are teaching in the same university.
A.neither of them
B.either of them
C.both of them
D.both of whom