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    --When will the World Exposition begin? --The Expo will begin May 1, 2010. A. in B. on C. at D. by 【查看更多】

     

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    —When will the World Exposition (世博会) begin?
    —The Expo will begin                May 1, 2010.
    [     ]
    A. in
    B. on
    C. at
    D. by

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