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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 419

_____ twice a year, whether it is a car or a bus, is a rule that every driver must obey in this city.

A.Examining B.Examined
C.To examine D.Being examined
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twiceayear,whetheritisacarorab