There is a new problemin the popularity of private cars that road conditions need improvin

问题补充：

There is a new problemin the popularity of private cars that road conditions need improving.

A. involved

B. to involve

C. involving

D. being involved

答案：

(答案→)A. involved

B. to involve

C. involving

D. being involved

解析：考查固定搭配。动词involve sb in sth使某人参与某事；转换为be involved in…参与…，涉及…；本题中的形容词短语involved in…对名词a new problem进行解释。句意：有一个涉及到私家车流行的新的问题，就是道路情况需要改善。故A正确。