英语四级

填空题_____________(环境一旦遭到破坏)，it takes many years for the system to recover

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【答案】Once environmental damage is done/caused或Once the environment is damaged
【解析】本题考查对once引导的条件状语从句的掌握。once除了作副词表示“曾经，从前”以外，还可以充当连词，引导 条件状语从句，意为“一旦…(就…)”。将汉语“遭到…”译成英文时应采用被动语态。

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