Once environmental damage（）, it takes long time for the ecosystem ( 生态系统 )to recover._精华吧

Once environmental damage（）, it takes long time for the ecosystem ( 生态系统 )to recover.

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Once environmental damage（）, it takes long time for the ecosystem ( 生态系统 )to recover.

A.does

B.is to do

C.has done

D.is done

正确答案：is done

Tag：职业综合英语生态系统时间：2022-01-01 21:52:56

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