My brother， his classmates often made fun a few years ago，is now studying in England．
A. of whom
B. who
C. about whom
D. whom
网友回答
(答案→)A. of whom
B. who
C. about whom
D. whom
解析：考察定语从句关系用法，make fun 后面一般接of 表示嘲笑取笑的意思。make fun of这里关系代词作make fun of的宾语，当关系作介词宾语时，只能使用宾格形式。故选A。