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---Someone’s been here. Who ___ it be? It looks like Helen.

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---Someone’s been here. Who ___ it be? It looks like Helen.
---It ___ be Helen.She is ill in hospital.
A.must; must B.might; could C.can; mustn’t D.can; can’t
---Someone’s been here. Who ___ it be? It looks like Helen.
D

can 常用于表示否定和问句的推测。