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Unless everyone ________ actions to stop...

Unless everyone ________ actions to stop pollution, the environment problem may become worse.

A. take    B. takes    C. took    D. will take

 

B 【解析】句意:除非每个人采取行动阻止污染,环境问题可能更糟糕。Unless引导的条件状语从句用一般现在时表示一般将来时,故选B。  
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