Not only are cars involved in most of the traffic accidents, but they also __________to the pollution of the air. . A、contribute B、promote C、refer D、matter

Not only are cars involved in most of the traffic accidents, but they also __________to the pollution of the air. .
A、contribute
B、promote
C、refer
D、matter

出自：合肥财经职业学院-计算机网络技术

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