There is a new problem involed in the popularity of private cars _____road conditions need ______
A.that ,to be improved B.which,to be improved C.where,improving
D.when ,improving
答案：A分析：1.原句的意思是：“交通状况有待改善是涉及到私家车污染的又一新问题”，句子的主干是“交通状况 是 问题”。可见这两部分是同位语关系，所以用that.2.need +动词ing形式= need to be +动词的-ed 形式，所以原句可以 写成：There is a new problem involed in the popularity of private cars that road conditions need improving.3.词组involve in 表示“关于，涉及”...
