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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1138

— They are said to have been familiar with each other.
— But they_________. They were introduced only hours ago.

A.may not have been B.couldn’t have been
C.mustn’t have been D.needn’t have been
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—Theyaresaidtohavebeenfamiliar