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    By the time the police came, the aliens for a few minutes. A. had left B. has left C. had been away D. has been away 【查看更多】

     

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    By the time the police came, the aliens _____ for a few minutes.
    [     ]
    A. have already left
    B. had left
    C. had been away

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    By the time the police came, the aliens ________ for a few minutes．

    [　　]

    A．had left

    B．has left

    C．had been away

    D．has been away

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