问题
选择题
There is a new problem ________ in the popularity of private cars that road conditions need improving. [ ]
A. involved
B. to involve
C. involving
D. being involved
答案
答案：A
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There is a new problem ________ in the popularity of private cars that road conditions need improving. [ ]
A. involved
B. to involve
C. involving
D. being involved
答案：A