Gun control is a subject ________Americans have argued for a long time,A.of whichB.with whichC.into whichD.about which
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D解析试题分析：考查定语从句：介词+which引导的定语从句修饰subject，从句中argue是不及物动词，argue about sth“争论某事”选D。考点：考查定语从句点评：定语从句的介词要根据先行词的搭配，或者从句中的动词，名词的搭配来选择。