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
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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 ( )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 ( )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
B
once 条件句是do harm to...“对.有害” 的被动式,排除A.
D 的be 形式有误.条件句不用将来时,排除C
一旦环境遭到破坏,数年后都难以恢复
一旦环境遭到破坏,数年后都难以恢复
B
从意思上了说,是被动,用be done,然后,D不对,这里是陈述一个事实,所以用现在时态,
Once 引导的时间状语从句应该使用 一般现在时表示将来时态,类似的还有条件和让步状语从句
此外这里还涉及一个短语: do harm to 意为对....有害, harm为do 的宾语,所以他们逻辑上有被动关系
综上所述,答案应该选B
once harm is done to the environment,it takes years to have the system _A recoverB recoveringC recoveredD to recover
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