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 recover.
A.has done
B.is to do
C.does
D.is done
B.is to do
C.does
D.is done
参考解析
解析：考查被动语态。当do作“造成”解时，为及物动词，因空格后没有宾语，所以应用被动语态，因此D项正确。故本题选D。句意：环境系统一旦被破坏，需数年才能恢复。
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