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There is a new problem involved in the popularity of private cars road condition

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There is a new problem involved in the popularity of private cars road condition

There is a new problem involvedin the popularity of private cars _______ road conditions need to be improved.

 A. that   B.which C. where D. when

 

试题答案

答案:A

解析:

这句考查的是有that引导的同位语从句,对problem进行解释说明。