The World Expo was opened __May 1st ,2010.划线处填什么介词?

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The World Expo was opened __May 1st ,2010.划线处填什么介词?
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The World Expo was opened __May 1st ,2010.划线处填什么介词?
The World Expo was opened __May 1st ,2010.划线处填什么介词?

The World Expo was opened __May 1st ,2010.划线处填什么介词?
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