--Someone'sbeenhere.Who________itbe?ItlookslikeHelen.--It________be

发布时间：2020-08-04 22:30:29

--Someone's been here. Who ________ it be? It looks like Helen.--It ________ be her. She is ill in hospital.A.must; mustB.might; couldC.can; mustn'tD.can; can't

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D解析can用于疑问句和否定句，表示可能性。
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