问题
选择题
Gun control is a subject _________ Americans have argued for a long time..
A．of which
B．with which
C．about which
D．into which
答案
答案：C
考察定语从句。该句为定语从句，先行词为subject, 在从句中作argue about 的宾语。
Argue about sth 就……话题进行争论
句意为，枪支的控制是一个美国人争论了很长时间的话题。