once environmental damage ________,it will take many years for the system to recoverA has done B is to do C does D is done 错在哪?还有D表示什么回答者：匿名 12-2 00:52 xieixe

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once environmental damage ________,it will take many years for the system to recoverA has done B is to do C does D is done 错在哪?还有D表示什么回答者：匿名 12-2 00:52 xieixe
once environmental damage ________,it will take many years for the system to recover
A has done B is to do C does D is done 错在哪?还有D表示什么
回答者：匿名 12-2 00:52 xieixe

once environmental damage ________,it will take many years for the system to recoverA has done B is to do C does D is done 错在哪?还有D表示什么回答者：匿名 12-2 00:52 xieixe
题意是
一旦环境被毁坏,（环境）系统将需要很多年来恢复
这里应该要选一个被动态,damage（破坏）被做,所以应该选D
B根本跟题意就不相符
这里是说破坏一旦被造成,那么damage就只能被做,不能选主动态的
如果选is being done表示的是正在被破坏,跟后面的时态不太配,而且翻译过来也会变得很奇怪了
其实如果有has been done我会选这个,因为它会更强调环境已经被破坏,这样会需要长时间来恢复
D选项没问题,我确信是这个.
不客气~希望对你有帮助~

我觉得这个题目选择是 C
这句话的意思大概是：一旦环境遭到了破坏，就会用好多年来恢复
所以主句的 it 是前面environmental damage
没有一点的被动含义，前面是环境破坏，后面的recover 的宾语也是environmental damage
所以只能选择主动语态，B D不对
be to do 是即将发生的事情，按照计划要做的事情~...

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D's the correct answer.

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