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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 167

Prices____ all the time and no one knows when they         stable.

A.are going up; become B.have been going up; will become
C.have gone up; will become D.have been gone up; become
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Pricesallthetimeandnooneknowsw