Not easy as the problem of pollution is______, no one should just stop trying.A.to solveB.to be solveC.solvingD.being solved
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A解析考查固定结构。Not easy as the problem of pollution is____,是as引导的让步状语从句，是一个倒装句，正常语序应是as the problem of pollution is not easy____结构，考查做某事不容易结构，即be not easy to do 结构，所以选A。