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    By the time he arrived at the airport, the plane . A. has taken off B. was taking off C. had taken off D. would take off 【查看更多】

     

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    By the time he arrived at the airport, the plane            .

    A. has taken off     B. was taking off    C. would take off  D. had taken off

     

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    By the time he arrived at the airport, the plane ________．

    [　　]

    A．has taken off

    B．was taking off

    C．would take off

    D．had taken off

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