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【题目】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

【答案】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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