A: When did the Shanghai Expo open? B: May 1st, 2010.A. InB. OnC. AtD. By

发布时间：2020-08-21 07:19:29

A: When did the Shanghai Expo open?
B:      May 1st, 2010.
A. In
B. On
C. At
D. By

网友回答

A. In
(答案→)B. On
C. At
D. By
解析：在具体的一天前加介词on，故选B
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