The old woman has two sons,one_________is a teacherA.of who B.of whom C.of which D.of them

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The old woman has two sons,one_________is a teacher
A.of who B.of whom C.of which D.of them

B
如果有and连接的话就选D,这里没有and连接,所以用whom来指代前面的two sons,介词用of.所以选B.

b

D.them指代两个儿子