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    【题目】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】考查时态和语态。句意：自从新的速度限制被提出，这个区的交通事故数量下降了很多。speed limits与introduce之间为被动关系，而且事情发生在过去，故用过去时态的被动式，故选A。

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