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 |