Once environmental damage __,it takes many years for the system to recoverA has done B is to do C does D is done

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Once environmental damage __,it takes many years for the system to recoverA has done B is to do C does D is done
Once environmental damage __,it takes many years for the system to recover
A has done B is to do C does D is done

Once environmental damage __,it takes many years for the system to recoverA has done B is to do C does D is done
D is done被做了,

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...

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