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【題目】Children need to sleep_______nine hours a night.

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

【答案】C

【解析】孩子們需要一晚睡眠九個小時。at后加時間點,表示在幾點鐘;on加具體的一天或者具體一天的上下午晚上;for加一段時間,表示達多久;to朝……,到……。根據nine hours, 故選C。

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