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    21． the boy was walking down the street, the UFO landed.A．While B．After C．Before D．until 【查看更多】

     

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    _______ the boy was walking down the street，the UFO landed．

    A．Why          B．Where            C．While          D．Whenever

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    ________ the boy was walking down the street，the UFO landed．

    [　　]

    A．While
    B．After
    C．As
    D．Before

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    ________ the boy was walking down the street，the UFO landed．

    [　　]

    A．While
    B．After
    C．As
    D．Before

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             tile boy was walking down tile street，the UFO landed．

    A．While           B．After             C．Before             D．ago

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    While the boy ________ down the street, the UFO landed．

    [　　]

    A．had walked

    B．was walking

    C．has walked

    D．is walking

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