There is a new problem _____ in the popularity of private cars _____ road conditions need to be improved.
A.involving ; that B.involved ; that C.involved; where D.involving ; which正确答案B
There is a new problem _____ in the popularity of private cars _____ road conditions need to be improved.
A.involving ; that B.involved ; that C.involved; where D.involving ; which正确答案B