I have many friends some are businessmen .A. of them B. from which C. who of D. of whom

问题补充：

I have many friends , some are businessmen .

A. of them

B. from which

C. who of

D. of whom

答案：

A. of them

B. from which

C. who of

(答案→)D. of whom

解析：本题引导定语从句的主语部分of whom some，实际语序为some of whom，介词of表示整体与部分的关系。