【題目】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

【答案】A

【解析】考查時(shí)態(tài)和語(yǔ)態(tài)。句意：自從新的速度限制被提出，這個(gè)區(qū)的交通事故數(shù)量下降了很多。speed limits與introduce之間為被動(dòng)關(guān)系，而且事情發(fā)生在過(guò)去，故用過(guò)去時(shí)態(tài)的被動(dòng)式，故選A。

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