I have two brothers are doctors.A. both of themB. both of whomC. neither of whomD. each

问题补充：

I have two brothers, are doctors.

A. both of them

B. both of whom

C. neither of whom

D. each of them

答案：

A. both of them

(答案→)B. both of whom

C. neither of whom

D. each of them

解析：考查非限制性定语从句。Neither表示否定，谓语用单数，排除C；A、D选项前应该加and，看作并列的两个分句，排除A、D；two brothers是先行词，both of whom“他们两个”，引导非限制性定语从句。故选B。