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    28． at the door before enterning please． A．Knocked B．To knock C．Knocking D．Knock 【查看更多】

     

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    ______ at the door before you enter my room, please.

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

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     ______ at the door before you enter my room, please.

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

     

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    Tom, _______ at the door before you enter my room, please.

    　 A. to knock B. knocking C. knocked D. knock

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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．KnockC．Knocking D．To knock

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