问题
选择题
I have two brothers, _______ are doctors.
A．both of them
B．both of whom
C．neither of whom
D．each of them
答案
答案：B
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。