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    【题目】Vehicle accidents have claimed many deaths in the past few years. _________ more action is taken, the problem will get dramatically worse.

    A. IfB. Unless C. After D. When

    【答案】B

    【解析】考查状语从句句意：交通事故过去一些年中夺取了许多人的生命，除非采取更多的措施否则问题将更加严重。依照句意此处表示的是“除非”之意，故选B项适合。

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