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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 764

Every few years, the coal workers                 their lungs X-rayed to ensure their health.

A.are having B.have C.have had D.had had
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Everyfewyears,thecoalworkersth