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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 843

Remember to do this in time of H1N1 ---         constantly the windows to let fresh air enter and move around inside, and avoiding the access to the crowds, a necessity everyday.

A.open B.we open C.opening; D.to open
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RemembertodothisintimeofH1N1co