◎ 题干
There is a new problem       the popularity of private cars that road conditions need       
[     ]
A.involved in;to be improved
B.involving in;to be improved
C.involving in;improving
D.involved in;improved
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“There is a new problem the popularity of private cars that road conditions need . [ ]A.involved in;to be improved B.involving in;to be improved C.involving…”主要考查了你对  【不定式的被动式】【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。