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_______environmental damage is done, it takes many years for the ecosystem to recover.

A．Even if

B．If only

C．While

D．Once

試題分析：考查連詞辨析。A即使，盡管；B要是…就好了；C當…時；然而；盡管；D一旦；句意：一旦環境被破壞，就要花很多年的事件讓生態系統恢復過來。
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系，因果關系用表因果的連詞，轉折關系用轉折連詞，并列關系用并列連詞，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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