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【题目】Children need to sleep_______nine hours a night.

A. at B. on C. for D. to

【答案】C

【解析】孩子们需要一晚睡眠九个小时。at后加时间点,表示在几点钟;on加具体的一天或者具体一天的上下午晚上;for加一段时间,表示达多久;to朝……,到……。根据nine hours, 故选C。

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