Since the new speed limits .the number of accidents in the area has fallen strikingly．( )A．were introducedB．introducedC．have been introducedD．have introduced 题目和参考答案——青夏教育精英家教网——

题目内容

18．Since the new speed limits ______，the number of accidents in the area has fallen strikingly．（　　）

	A．	were introduced		B．	introduced
	C．	have been introduced		D．	have introduced

分析自从新限速规定实施以来，这个区域的交通事故明显下降．

解答答案：A．
主句的谓动词用现在完成时，而且须是延续性动词；而since引导的时间状语从句的谓语动词用一般过去时，而且须是终止性动词．所以要选 A．因为the new speed limits与introduce之间是逻辑上的动宾关系，所以用被动语态，可排除B和D；C是完成时与句意"新限速规定实施"矛盾，所以也可排除．

点评对于句子的时态问题要结合句子的表述内容和具体语言环境来进行推测．

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