问题描述:
School is over at half past five. Everyone must finish their work 5:20 pm. A. at B. by C. in D. on 老师您好,在具体的时间前不是应该用at吗,我觉得应该选A?而答案选择是C;在百度里搜索同样的题目选择的是B。到底应该选哪个?为什么?
问题解答:
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