once harm is done to the environment,it takes years to have the system _A recoverB recoveringC recoveredD to recover

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• Once harm ( )to the environment,it takes years to have the system recovered 括号里填什么,为什么A.does B.is done C.will be done D.be done
• once harm is done to the environment,it takes years to have the system _A recoverB recoveringC recoveredD to recover
• once harm____(do)to the environment,it takes years to have the system recovered.
• once harm is done to the environment,it takes years to have the system _
• Once harm ( )to the environment,it takes years to have the system recovered 括号里填什么,为什么
• Once harm is done to the environment,it takes years to have the system recovered.这是什么从句?哪是从句,哪是主句?
• Once harm is done to the environment,it takes years to have the system recovered.
• once harm____(do)to the environment,it takes years to have the system recovered.
• Once harm ( )to the environment,it takes years to have the system recovered 括号里填什么,为什么A.does B.is done C.will be done D.be done
• once harm____(do)to the environment,it takes years to have the system recovered.