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Once environmental damage ____, it takes many years for the

时间:2021-08-03 11:10来源:未知作者:admin 点击: 次

(单选题)9: Once environmental damage ____, it takes many years for the system to recover. A: is to do B: does C: had done D: is done

(单选题)9: Once environmental damage ____, it takes many years for the system to recover.

A: is to do

B: does

C: had done

D: is done

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