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

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

【答案】D

【解析】句意:我必須在十點(diǎn)之前上床睡覺。on在具體的某一天;in泛指在上午、下午或者晚上;在年代、月份、季節(jié)前;for持續(xù)一段時(shí)間;by之前。根據(jù)句意可知,這里說的是10點(diǎn)之前必須睡覺,故應(yīng)選D。

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