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    35．The boy was walking down the street ．the UFO landed． A．when 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．when    B．after             C．before             D．until

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    The boy ____ down the street when the UFO landed（着陆）.

    [　　]

    A．walk

    B．was walking

    C．walked

    D．is walking

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