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


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