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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1255

________twice a year,whether it is a car or a bus or a truck,is the rule that every driver must obey in this city.

A.Examining
B.Examined
C.Being examined
D.Having been examined
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twiceayear,whetheritisacarorab