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【题目】I have to go to bed __ 10 o’clock.

A. on B. in C. for D. by

【答案】D

【解析】句意:我必须在十点之前上床睡觉。on在具体的某一天;in泛指在上午、下午或者晚上;在年代、月份、季节前;for持续一段时间;by之前。根据句意可知,这里说的是10点之前必须睡觉,故应选D。

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