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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
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The World Expo 2010 is being held at a time        the world is looking for a new kind of balance between nature and cities.

A.which B.where C.when D.that
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TheWorldExpo2010isbeingheldata