The old professor has three sons are doctors.A. all of themB. all of whomC. all of thatD.

问题补充：

The old professor has three sons，are doctors.

A. all of them

B. all of whom

C. all of that

D. all of which

答案：

A. all of them

(答案→)B. all of whom

C. all of that

D. all of which

解析：考查定语从句。本题的先行词是three sons，在定语从句中whom指代先行词在句中做of的宾语，因为先行词是人，所以使用whom表示。句意：那个老教授有三个儿子，所有的儿子都是医生。

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