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    --Did they come to the biology laboratory ? --I don't know. They while I was out. A. might have come B. might come C. should have come D. must have come 【查看更多】

     

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    ―Did they come to the biology laboratory ?（ ）

    ―I don't know. They _______ while I was out.

    A. might have come　　　　　　　　　 B. might come

    C. should have come　　　　　　　　　 D. must have come

     

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    －Did they come to the biology laboratory?

    －I don't know．They ________ while I was out．

    [　　]

    A．might have come

    B．might come

    C．should have come

    D．must have come

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