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 |