Once harm to the environment, it takes years to have the system recovered.A. doesB. is do

发布时间：2020-08-16 08:10:23

Once harm      to the environment, it takes years to have the system recovered.
A. does
B. is done
C. will be done
D. be done

网友回答

A. does
(答案→)B. is done
C. will be done
D. be done
解析：可联系答.案.网客服索取。
以上问题属网友观点，不代表本站立场，仅供参考！