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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 207

____carefully for a long time,the opening was a great success

A.To have been prepared
B.Having been prepared
C.To be prepared
D.Being prepared
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carefullyforalongtime,theopeni