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Once environmental damage , it takes many years for the system to recover.A
Once environmental damage , it takes many years for the system to recover.A
游客
2023-09-25
14
管理
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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