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    ______environmental damage is done，it takes many years for the ecosystem to recover.
    A．Eyen ifB．If onlyC．WhileD．Once
    D
    答案为D. 考查连词用法。even if意为“即使”引导让步状语从句；if only意为“要是……该多好，但愿”常用虚拟语气；while意为“当……的时候；然而”；once意为“一旦”引导时间状语从句，从题意来看．应该选D才符合。
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