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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:355

The city of Qingdao has been working on building itself up as a city of sails ________ it successfully hosted the 2008 Olympics’ sailing program.

A.after B.since C.when D.until
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ThecityofQingdaohasbeenworking