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The lady ________ have done something wrong, because she is looking guilty.
A.wouldB.shouldC.canD.must
D

试题分析: 句意:这个女士一定做了错事,因为她看起来很内疚。表示肯定推测用“must have done”,would have done“本来会做”,can have done“本可以做却没有做”,should have done过去本应该做却没有,所以选D。
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