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    精英家教网 > 高中英语 > 题目详情
    ---Someone’s been here. Who ___ it be? It looks like Helen.
    ---It ___ be Helen.She is ill in hospital.
    A．must; mustB．might; couldC．can; mustn’tD．can; can’t
    D
    can 常用于表示否定和问句的推测。
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