______environmental damage is done，it takes many years for the ecosystem to recover.
A．Eyen ifB．If onlyC．WhileD．Once
D
答案為D. 考查連詞用法。even if意為“即使”引導(dǎo)讓步狀語從句；if only意為“要是……該多好，但愿”常用虛擬語氣；while意為“當(dāng)……的時(shí)候；然而”；once意為“一旦”引導(dǎo)時(shí)間狀語從句，從題意來看．應(yīng)該選D才符合。
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