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    【题目】As we all know，it's not polite to keep others ________for a long time.

    A．wait B．waited

    C．to wait D．waiting

    【答案】D

    【解析】keep sb.doing sth.“使某人一直做某事”，动名词作宾补。句意是“我们都知道，让别人一直等很长时间是不礼貌的。”故选D。

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