Many accidents ______ by careless drivers last year.

　　A. are caused     B. were caused     C. have caused      D. will cause

 

【答案】

B

【解析】本題是對被動語態(tài)的考察，主語accidents與謂語動詞cause是被動關系，而且整體時態(tài)從yesterday可知是一般過去時。

 

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