English is a language shared by several different cultures but each of uses it somewhat

问题补充：

English is a language shared by several different cultures, but each of uses it somewhat differently.

A. which

B. what

C. them

D. whom

答案：

A. which

B. what

(答案→)C. them

D. whom

解析： 通过分析句子结构，可知是由but连接的并列句，故填them。