Question

【题目】Gun control is a topic ____________ Americans have discussed for a long time.

A. of which B. with which

C. about which D. into which

Answer 1

【答案】 C

【解析】

试题分析：考查定语从句。先行词是Gun control，指物，关系词在从句中做介词的宾语，介词前置，介词与从句动词构成搭配argue about sth，故选C。