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（2017·辽宁丹东·32）—Many accidents ________ by careless drivers last year. —Oh，that's terrible. We must f...
题目内容：
（2017·辽宁丹东·32）—Many accidents ________ by careless drivers last year.
—Oh，that's terrible. We must follow the traffic rules.
A. are caused B. were caused C. have caused D. caused
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