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  • 更新 2022-09-03
  • 科目 英语
  • 题型 选择题
  • 难度 中等
  • 浏览 966

______, the conference began.

A.The candidates having taken their seats
B.The candidates had taken their seats
C.Taken their seats
D.Taking their seats
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,theconferencebegan.A.Thecandi