2．There is still a long way to go to work out all the problems conservation of natural——青夏教育精英家教网—

摘要：2．There is still a long way to go to work out all the problems conservation of natural resources． A．concerning B．concerned C．to concern D．concern

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There is still a long way to go to work out all the problems ______________conservation of natural resources. w*w*w*k*s*5*u*c*o*m