﹣Many accidents ______by careless drivers last year．
﹣Oh，that's terrible．We must follow the traffic rules．（ ）
A．are causedB．were caused
C．have causedD．caused
﹣Many accidents ______by careless drivers last year．
﹣Oh，that's terrible．We must follow the traffic rules．（ ）
A．are causedB．were caused
C．have causedD．caused
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