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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
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6. Measures have been taken to prevent accidents, but much ______ for more improvement.

A.remains to be done B.is remained to do
C.remains to do D.is remained to be done
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相关知识点

6.Measureshavebeentakentopreve