Question

(2009·陕西)Gun control is a subject ________ Americans have argued for a long time.

A．of which B．with which

C．about which D．into which

 

Answer 1

C

【解析】先行词为subject，将先行词还原到定语从句中：Americans have argued about the subject for a long time。由此可以看出被还原部分为about the subject，这样可以确定所选的介词为about。