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

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

    【答案】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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