4.There is a new problem involved in the popularity of private cars road conditions need ---------.A.that; to be improvedB.which; to be improvedC.where; improvingD.when; improving

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4.There is a new problem involved in the popularity of private cars road conditions need ---------.A.that; to be improvedB.which; to be improvedC.where; improvingD.when; improving
4.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

4.There is a new problem involved in the popularity of private cars road conditions need ---------.A.that; to be improvedB.which; to be improvedC.where; improvingD.when; improving
A 同位语从句

D