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题目内容 (请给出正确答案)
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:
本题考查被动语态。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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