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【题目】—Staying up late ____ bad for your health.

—I’ll go to bed right away.

A. is B. are C. was

【答案】A

【解析】句意:--晚睡是对你的健康有害的。--我马上就睡觉。动词ing形式staying up late是句子的主语,此句表示的概念性的动作,而且是单一概念,故谓语动词用一般现在时,单数形式。故选A。

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