摘要：40．Once harm to the environment, it takes years to have the sy stem recovered． A．does B．is done C．will be done D．be done
网址：http://m.1010jiajiao.com/timu3_id_3223666[举报]
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
查看习题详情和答案>>
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
查看习题详情和答案>>
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 |