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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1804

The central heating system of this office building is down and several workers ______ it right now.

A.had repaired B.have repaired C.repaired D. are repairing
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Thecentralheatingsystemofthiso