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    He stepped into the office, down and began to work at once. A. sitting B. to sit C. having sat D. sat [解析]选D.分析句子结构可知.空格部分在句中作并列谓语.故用sat. 【查看更多】

     

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    He stepped into the office, _______ down and began to work at once．

    [　　]
    A．

    sitting

    B．

    to sit

    C．

    having sat

    D．

    sat

    查看答案和解析>>

    He stepped into the office, ________ down and began to work at once．

    [　　]
    A．

    sitting

    B．

    to sit

    C．

    having sat

    D．

    sat

    查看答案和解析>>


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