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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1013

We are now faced with a new problem involved in the popularity of private cars __________ road conditions need __________.

A.which; to be improved B.that; to be improved
C.where; improved D.when; improved
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Wearenowfacedwithanewproblemin