题目内容
________ Sunday morning, he cleaned his room. _______ the afternoon, he did his homework. __________ night, he watched Olympic Games.
| A．On; On; On | B．On; In; At |
| C．On; In; In | D．In; In; At |
B
解析试题分析：句意:在星期天早上，他打扫了他的房间。在下午，他做作业。在晚上，他观看了奥运会。on 用于具体的某一天的早上、下午或晚上；in用于泛指在上午、下午或晚上；at night在晚上，是固定短语。因此应该选B。
考点：考查介词。
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