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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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It’s quite normal to     ten percent of the cost of a building for a period of six months or so, in case faults are found in it.

A.keep up B. keep away C.keep off D.keep back
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It’squitenormaltotenpercentoft