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during; on from; to between; of on; till
where would the next Expo be held when would the next Expo start what would the next Expo be held for how many countries would take part in the next Expo
where will the next Expo（世博会）be held when will the next Expo start what will the next Expo be held for how many countries will take part in the next Expo
take up take on take place take off
which; it that; it that; one which; it
is World Expo 2010 World Expo 2010 is has World Expo 2010 been World Expo 2010 has been
when will World Expo Shanghai be held when World Expo Shanghai will be held how soon will World Expo Shanghai be held how soon World Expo Shanghai will be held
the; 不填 不填; the the; the the; a
A.——；a the ; a the ; the / ; /
needn’t may not mustn’t will not
is World Expo 2010 World Expo 2010 is has World Expo 2010 been World Expo 2010 has been
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