问题描述：
THe concept of preserving nature from man's interference ____powerful and enduring :a century la...
THe concept of preserving nature from man's interference ____powerful and enduring :a century later,the Wilderness Act of 1964 empowered states to appoint protected land.
A.proved B.had been proved C.will prove D.was proved
THe concept of preserving nature from man's interference ____powerful and enduring :a century later,the Wilderness Act of 1964 empowered states to appoint protected land.
A.proved B.had been proved C.will prove D.was proved
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