Many accidents______by careless drivers last year.

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问题 Many accidents______by careless drivers last year.

选项 A、are caused
B、were caused
C、have caused
D、will cause

答案B

解析 本题是对被动语态的考查,主语accidents与谓语动词cause是被动关系,而且整体时态从last year可知是一般过去时。
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