The old professor has three sons，________are doctors. A．all of them B．all of whom C．all of that D．al...
2022-12-18 05:24:56 68次 2014届甘肃省武威市高二下学期期中测试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The old professor has three sons，________are doctors.
A．all of them B．all of whom
C．all of that D．all of which
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