问题补充：
单选题You______furtherintothismatter.Ifso,you______knowwhodiditnow.A.must have enquired; willB.should have enquired; wouldC.could have enquired; willD.shouldn’t have enquired; would
答案：
B解析考查语法should have done 本应该做某事而未做，后面用虚拟语气
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