She is almost 2 hours lateShe is almost 2 hours late. What ________ to her?A.should have happenedB.must have happenedC.may have happenedD.can have happened
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D解析在疑问句中表示推测，应使用“can”；是对过去情况的推测，所以使用can have done在疑问句中表示推测，应使用“can”；是对过去情况的推测，所以使用can have done。