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    精英家教网 > 高中英语 > 题目详情

    【题目】__________ at the door before you enter my room, please.

    A. Knock

    B. Knocking

    C. Knocked

    D. To knock

    【答案】A

    【解析】句意：请在进人我的房间前先敲门。动词原形构成祈使句。

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