There is a new problem involved in the popularity of private cars road conditions need.

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问题 There is a new problem involved in the popularity of private cars ______ road conditions need______.

选项 A、that; to be improved
B、which; to be improved
C、where; improving
D、when; improving

答案A

解析句子结构分析题。过去分词短语involved in the…cars作后置定语修饰problem，第一个空格后是一个完整的句子，根据句意可看出这是同位语从句，说明problem的具体内容，只能用引导词that，答案为A。need后面可接动名词表被动关系，等同于need to be done。

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