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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1355

Bob would have helped us yesterday, but he ____________.

A.is busy B.had been busy C.has been busy D.was busy
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Bobwouldhavehelpedusyesterday,