There are fifty students in our class are girls .A. most of themB. most of whomC. most o

问题补充：

There are fifty students in our class, are girls .

A. most of them

B. most of whom

C. most of who

D. most of which

答案：

A. most of them

(答案→)B. most of whom

C. most of who

D. most of which

解析：考查定语从句。先行词为students，作most of的宾语，故选B。