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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 881

You shouldn’t have the machines ______ all the while. You ought to have them ______ now and then.

A.run; repair B.running; repairing C.run; repaired D.running; repaired
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Youshouldn’thavethemachinesall