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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2095

The key______ the problem of traffic jams is to pay the “ congestion charge” ______ by the mayor of London.

A.to solving; introducing
B.to solve; introducing
C.to solving; introduced
D.to solve; introduced
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Thekeytheproblemoftrafficjamsi