Once environmental damage ______, it takes many years for the system to recover.

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问题 Once environmental damage ______, it takes many years for the system to recover.

选项 A is to do
B does
C had done
D is done

答案D

解析考点:动词被动语态。本题从句部分的主语中心词是damage“破坏”，与do是动宾关系。句意：一旦环境遭到破坏，需要很多年才能恢复过来。

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