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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1581

—Fire is very useful to human!
—Yes, especially in winter a fire _____________warm.

A.used to keep B.can be used to keep
C.is used to keeping D.was used to keeping
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相关知识点

—Fireisveryusefultohuman!—Yes,