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    at the door before entering please. A. Knock B. To knock C. knocking D. Knocked 【查看更多】

     

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    ______ at the door before entering please.

    A．Knocked          B．Knock            C．Knocking          D．To knock

     

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    _____ at the door before entering please.

    A. Knocked 　 B. To knock　 C. Knocking 　 D. Knock

     

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    ________ at the door before entering, please.

    A．Knocked

    B．To knock

    C．Knocking

    D．Knock

     

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    ________ at the door before entering, please.

    A．Knocked

    B．To knock

    C．Knocking

    D．Knock

     

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    ________ at the door before entering, please.

    [　　]

    A．Knocked
    B．To knock
    C．Knocking
    D．Knock

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