He has two sons,one______is doctor.A.OF them B.of that C.of which

问题描述:

He has two sons,one______is doctor.A.OF them B.of that C.of which
应该选哪个?为什么呢?

选C.
原句不是并列句,所以不能选 A.
如果加个 and ,就可以选 A.了