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    Was it 8 o’clock you heard someone at the door? A. When; knocking B. when; knock C. that; knocking D. that; knock 【查看更多】

     

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    Was it 8 o’clock ________ you heard someone ________ at the door?

    [　　]
    A．

    when; knocking

    B．

    when; knock

    C．

    that; knocking

    D．

    that; knock

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