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    34．While the boy down the street, the UFO landed． A．had walked B．was walking C．has walked D．is walking 【查看更多】

     

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

    [　　]
    A．

    had walked

    B．

    was walking

    C．

    has walked

    D．

    is walking

    查看答案和解析>>


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