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Traffic accidents have caused many death...

Traffic accidents have caused many deaths in the past few years.        more action is taken,the problem will get even worse.

A. Unless    B. If    C. After    D. When

 

A 【解析】句意:在过去的几年中,交通事故已经导致了许多人死亡。除非采取措施,这个问题将变得更糟。Unless除非;if如果;after在……之后;when当…..时候;结合句意,表示不采取行动,问题会更严重,故用连词unless,故选A。  
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