【題目】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”，動名詞作賓補(bǔ)。句意是“我們都知道，讓別人一直等很長時間是不禮貌的。”故選D。

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