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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1689

______ once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers must obey in our country.

A.Having been examined B.Examined
C.Examining D.Being examined
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onceeverytwoyears,whetheritisa