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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 first World Cities Day of the UN, _______on Oct.31, 2014 in Shanghai, focused on leading urban transformation.

A.to have been held B.having held
C.held D.being held
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ThefirstWorldCitiesDayoftheUN,