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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1503

We have done things we ought not to have done and ________ undone things we ought to have done.

A.left B.leaving C.will leave D.to leave
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Wehavedonethingsweoughtnottoha