.He has three brothers is a doctor.A. all of them B. all of whomC. both of themD. none o

问题补充：

.

He has three brothers, is a doctor.

A. all of them

B. all of whom

C. both of them

D. none of whom

答案：

A. all of them

B. all of whom

C. both of them

(答案→)D. none of whom

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