Many accidents________ by careless drivers last year.
A．a(chǎn)re causedB．were causedC．have causedD．will cause
B

試題分析：考查被動語態(tài)。句意：去年，許多事故是由粗心造成的。事故是被引起的，應(yīng)該使用被動語態(tài)，再根據(jù)last year確定使用一般過去時，排除A、C、D。故選B。
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