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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 215

The doctors are doing all that they _____, but the old man is still not breathing properly.

A.shall B.need C.may D.can
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Thedoctorsaredoingallthatthey,