【題目】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】考查狀語從句句意：交通事故過去一些年中奪取了許多人的生命，除非采取更多的措施否則問題將更加嚴(yán)重。依照句意此處表示的是“除非”之意，故選B項(xiàng)適合。

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