题文
--When did the World Exposition(世博会) in Shanghai begin?
--The Expo began ________ May 1, 2010.
| A．in | B．on | C．at | D．by |
--When did the World Exposition(世博会) in Shanghai begin?
--The Expo began ________ May 1, 2010.
| A．in | B．on | C．at | D．by |
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