there is a new problem __ in the popularity of private cars __ road conditions need to be improved.

there is a new problem __ in the popularity of private cars __ road conditions need to be improved.

题目
there is a new problem __ in the popularity of private cars __ road conditions need to be improved.
为什么第一空要填involved?
答案
new problem为主语,它是被动的,所以要用be involved
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