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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1591

Sheldon could have defeated Howard in the match, but he _______ too careless at the last minute. 

A.is B.was C.has been D.had been
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SheldoncouldhavedefeatedHoward