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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2044

The machine has been used many years. It’s no wonder that it doesn’t work well________.

A.regularly B.constantly C.occasionally D.frequently
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Themachinehasbeenusedmanyyears