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Gun control is a subject       Americans have argued for a long time.
A.of whichB.with which
C.about whichD.into which
答案:C
试题分析:考查介词+关系代词。句意:枪支管制是美国人一直在谈论的一个话题。argue about sth谈论某事,先行词是subject,which引导定语从句并在定语从句中作宾语,故选C。
考点:考查介词+关系代词