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10．_______ environmental damage is done，it takes many years for the ecosystem to recover．（　　）

A．

Even if

B．

If only

C．

While

D．

Once

分析一旦環境被破壞，就得需要許多年的時間來恢復生態系統．

解答答案D．
even if"盡管，即使"，引導讓步狀語從句．if only"但愿，要是"，用于使用虛擬語氣的句子中．while表示"當…的時候"，引導時間狀語從句；意為"盡管、雖然"，引導讓步狀語從句；意為"而、但是"，引導比較狀語從句．once"一旦"，引導時間狀語從句．分析可知前后兩句話之間是邏輯上的"時間"關系，可排除A和B；再結合句子所表達的意思"一旦環境被破壞"可知答案選D．

點評本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關系，再確定相應的連詞，同時注意不同的連詞的語義及用法區別．

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