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    【题目】My umbrella is gone. Who ______________ have taken it by mistake?

    A.couldB.shouldC.wouldD.must

    【答案】A

    【解析】

    考查情态动词+have done的用法。句意：我的伞不见了。谁会把它拿错了呢？A. could (have done) 表示对过去发生的事情的可能性推测；B. should (have done) 表示本应当做某事，却没做；C. would (have done) 用于虚拟语气；D. must (have done)表示对过去的肯定推测。根据语境可知，此处表示对过去可能性的推测，用于疑问句，应使用could (have done)。故选A。

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