[题目]Laughing at others (be)impolite. 题目和参考答案——青夏教育精英家教网—

【题目】Laughing at others （be）impolite.

【答案】is
【解析】句意：嘲笑别人是不礼貌的。Laughing at others作主语，指嘲笑别人这种行为，视作单数，所以答案是is。

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