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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 895

The operation room in every hospital has to _______bacteria of any kind so that the patient being operated on doesn’t get infected.

A.keep free from B.make it free from C.to be made free with D.be kept free from
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Theoperationroomineveryhospita