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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1705

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

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