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?

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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?
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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?
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?

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?
new problem为主语,它是被动的,所以要用be involved