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    6．He was shocked his son playing all day. A．knowing B．to know C．know D．known 【查看更多】

     

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    He was shocked _______ his son playing all day.

    [　　]

    A．knowing
    B．to know
    C．at know
    D．known

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    He was shocked ________ his son playing all day．

    [　　]

    A．knowing

    B．to know

    C．at know

    D．known

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