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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 753

He had to pause from time to time to wipe the sweat from his forehead,because the air-conditioning system __________.

A.broke in
B.broke up
C.broke out
D.broke down
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Hehadtopausefromtimetotimetowi