There is a new problem involved in the popularity of private cars ____________ road conditions need ____________.
A.that; to be improved | B.which; to be improved |
C.where; improving | D.when; improving |
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There is a new problem involved in the popularity of private cars ____________ road conditions need ____________.
A.that; to be improved | B.which; to be improved |
C.where; improving | D.when; improving |