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

游客2024-07-03 47

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

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

答案 B

解析 damage与谓语“做”之间是被动关系，所以用is done。

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