Once environment damage , it takes many years for the system to recover.A. has doneB. is t

发布时间：2020-08-16 06:02:42

Once environment damage     , it takes many years for the system to recover.
A. has done
B. is to do
C. does
D. is done

网友回答

A. has done
B. is to do
C. does
(答案→)D. is done
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