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    ( )----What is behind that tree? ----There must be a dog behind it . A. sit B. say C. to sit D. sitting 【查看更多】

     

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    --What is behind that tree?

    --There must be a dog ________ beside it.

    [　　]

    A. sit
    B. sat
    C. to sit
    D. sitting

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    --What is behind that tree?

    --There must be a dog ________ beside it.

    [　　]

    A. sit
    B. sat
    C. to sit
    D. sitting

    查看答案和解析>>

    －What is behind that tree?

    －There must be a dog ________ beside it.

    [　　]

    A．sit
    B．sat
    C．to sit
    D．sitting

    查看答案和解析>>


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