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【题目】Since the new speed limits ______,the number of accidents in the area has fallen strikingly.

A.were introducedB.introduced

C.have been introducedD.have introduced

【答案】A

【解析】

自从新的速度限制被提出,这个区交通事故的数量下降了很多。Since +过去式,主句+现在完成时,为常用句型。故排除C、D.而since 引导句子中缺少谓语,而speed limits与introduce之间为被动关系故选A

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