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

发布时间：2020-08-17 14:46:50

There is a new problem involved in the popularity of private cars     road conditions need to be improved.
A. that
B. which
C. where
D. when

网友回答

(答案→)A. that
B. which
C. where
D. when
解析：该句为分隔性同位语从句。that引导同位语从句，作problem的同位语，解释problem的具体内容。
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