Once environmental damage ___, it takes many years for the s

时间:2021-11-30 13:22来源:未知作者:admin 点击: 次

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

20：Once environmental damage ___, it takes many years for the system to recover.

A：has done

B：is to do

C：does

D：is done

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