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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1905

He failed the final examination and only then ____ how much time he had wasted.

A.he realized B.had he realized
C.he had realized D.did he realize
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Hefailedthefinalexaminationand