题目内容
【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
【答案】C
【解析】句意：强制控制是美国人长期讨论的话题。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
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