The forty-first Expo was held May 1st 2010 in Shanghai. 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

The forty-first Expo was held May 1st 2010 in Shanghai.
A. in B. on C. at

B

试题分析：句意：第四十一届世博会在2010年五月一日在上海举行。在具体的一天，用介词on，五月一日是具体的一天，故选B。

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