Once environmental damage, it takes many years for the system to recover.A．had doneB．is do

Once environmental damage __________,选择

It is getting more popular due to its high efficiency and its environmental friendlin

A huge amount of environmental damage has been brought_____by the destruction of the rainf

Once damage______, it takes many years for the natural environment to recover.A．has doneB．

Once environmental damage_____, it takes hundreds of years for the system to recover.A．has

Success can breed success if you ______ it.A tak