The World Expo (世博會) was opened             May 1st, 2010.

A. in
B. on
C. at
D. for
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科目:初中英語 來源:0119 期末題 題型:單選題

The World Expo (世博會) was opened             May 1st, 2010.
[     ]
A. in
B. on
C. at
D. for

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