World No Smoking Day is May 31. A. in B. on C. at 题目和参考答案——青夏教育精英家教网——

题目内容

World No Smoking Day is ________ May 31.
A. in B. on C. at

B

介词辨析。在表示时间时，in表示在一个时间范围；on表示在具体某一天；at表示在具体时刻。根据下文五月三十一日，可知选B。在具体一天前用介词on ，故选B

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