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

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

选项 A、Even if
B、Unless
C、While
D、Once

答案D

解析 even if：即使，虽然，引导让步状语从句；unless：如果不，除非，引导条件状语从句；while：当……的时候，尽管，引导时间和让步状语从句；once：一旦，引导时间状语从句。根据句意并分析句子结构可知，选D。

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本试题收录于：英语题库普高专升本分类

英语

普高专升本

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

英语

普高专升本

AftertheviolentearthquakethatshookLosAngelesin1994,earthquakescientistshadnewstoreport:Thedamageanddeathtoll

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Itisexcitingtoapplyforajobthatreallyappealstoyou.Inwritingyourletterofapplication,thereareanumberofpoint

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