问题补充:
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
答案:
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。
如果觉得《Once harm to the environment it takes years to have the system recovered.A. doesB. is do》对你有帮助,请点赞、收藏,并留下你的观点哦!