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    ----This plane have taken off half an hour ago. ----I’m terribly sorry, madam. A. must B. could C. ought D. should 【查看更多】

     

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    －This plane ________ have taken off half an hour ago．

    －I'm terribly sorry, madam．

    [　　]

    A．must

    B．could

    C．should

    D．would

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