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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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They have been waiting for many hours to see the singer, but the airplane must have been _____.

A.behind the times B.behind schedule
C.ahead of time D.in no time
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Theyhavebeenwaitingformanyhour