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There is a new problem involved in the popularity of private cars_road conditions need _. [

题目简介

There is a new problem involved in the popularity of private cars_____road conditions need _____. [

题目详情

There is a new problem involved 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

题型：单选题难度：中档来源：山东省期中题

答案

A

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