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    39．The country has already sent up three unmanned spaceship, the most recent at the end of last March． A．has been launched B．having been launched C．being launched D．to be launched 【查看更多】

     

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    The country has already sent up three unmanned spaceship, the most recent ________ at the end of last March．

    [　　]
    A．

    has been launched

    B．

    having been launched

    C．

    being launched

    D．

    to be launched

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