There is a new problem involved in the.There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用别的,是不是因为同谓语从句只能用that.最恰当的中文

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There is a new problem involved in the.There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用别的,是不是因为同谓语从句只能用that.最恰当的中文
There is a new problem involved in the.
There is a new problem involved in the popularity of private cars ___ road conditions need___(improve)
为什么第一格只能用that不用别的,
是不是因为同谓语从句只能用that.
最恰当的中文是什么?
第二格为什么用to be improved?

There is a new problem involved in the.There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用别的,是不是因为同谓语从句只能用that.最恰当的中文
第一格需要that引导一个problem的同位语从句.
句意:
私家车的普及过程中又碰到一个新的问题:道路条件(即“路况”)需要提高.
[简单分析]
need to do sth.表示需要...,有必要...
此句improve是及物动词,它的用法是sb.improve sth.,道路是被improve的对象,故用被动语态,也就是need to be done"的形式.