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【題目】There is still a long way to go to solve all the problems _________conservation of natural resources.

A. concerning B. concerned

C. concerning about D. concerned about

【答案】A

【解析】考查現(xiàn)在分詞。concerning是介詞，相當于about，意為“與……有關，關于”。根據(jù)句意可知選A。

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