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Not only are cars involved in most of the traffic accidents, but they also __________to the pollution of the air. .
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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
时间：2021-09-01 16:17
关键词：
安徽教育在线
合肥财经职业学院
计算机网络技术
答案解析
A
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