Once environmental damage （）, it takes many years for the system to recover._精华吧

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

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

A.is to do

B.does

C.had done

D.is done

正确答案：D

Tag：大学英语时间：2022-05-08 23:07:03

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