_______environmental damage is done, it takes many years for the ecosystem to recover.
A．Even if B．If only C．While D．Once
D

試題分析：考查連詞辨析。A即使，盡管；B要是…就好了；C當(dāng)…時；然而；盡管；D一旦；句意：一旦環(huán)境被破壞，就要花很多年的事件讓生態(tài)系統(tǒng)恢復(fù)過來。
點評：此題主要考查連詞的辨析，選擇連詞主要是看前后句的關(guān)系，因果關(guān)系用表因果的連詞，轉(zhuǎn)折關(guān)系用轉(zhuǎn)折連詞，并列關(guān)系用并列連詞，要求考生具有一定的句子分析能力和詞義辨析能力。
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