【題目】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】

自從新的速度限制被提出,這個區(qū)交通事故的數(shù)量下降了很多。Since +過去式,主句+現(xiàn)在完成時,為常用句型。故排除C、D.而since 引導(dǎo)句子中缺少謂語,而speed limits與introduce之間為被動關(guān)系故選A

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