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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
参考答案
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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名词解释题环境管理体系（Environmental Management System）
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