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单选题
Once environmental damage_____, it takes many years for the system to recover.
A

had done

B

does

C

is to do

D

is done

参考答案

参考解析
解析：
句意：环境一旦遭到破坏，需要很多年才能恢复过来。主语environmental damage与谓语do之间是被动关系，而且表述的是普遍事实，所以时态应为一般现在时，故答案为is done。
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