Question

There are over 6000 students in the university,many of___come from overseas.

A.them B.whom C.which D.those

Answer 1

填 whom，后面是一个非限制性定语从句。 of是介词，后面不能跟who。 A不对。如果要填them的话，应该变为两个句子。
即：There are over 6000 students in the university and many of them come from overseas.

Answer 2

A.them

of是介词，介词后边跟宾格形式。