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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 479

After pains-taking efforts, he eventually concluded that the principle he stuck _______ true.

A.to proved B.to proving
C.to be proved D.to being proved
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Afterpainstakingefforts,heeven