问题补充：
Many accidents by careless drivers last year.
A. are caused
B. were caused
C. have caused
D. will cause
答案：
A. are caused
(答案→)B. were caused
C. have caused
D. will cause
解析：本题是对被动语态的考察，主语accidents与谓语动词cause是被动关系，而且整体时态从yesterday可知是一般过去时。
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