Nowadays,more and more people are using private cars,______ __ has caused a lot of trafficproblems,especially in large cit es like Beijing and Shanghai.A.that B.which C.it D.they

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Nowadays,more and more people are using private cars,______ __ has caused a lot of trafficproblems,especially in large cit es like Beijing and Shanghai.A.that B.which C.it D.they
Nowadays,more and more people are using private cars,______ __ has caused a lot of traffic
problems,especially in large cit es like Beijing and Shanghai.
A.that B.which C.it D.they

Nowadays,more and more people are using private cars,______ __ has caused a lot of trafficproblems,especially in large cit es like Beijing and Shanghai.A.that B.which C.it D.they
b.which