问题补充：
Not easy as the problem of pollution is, no one should just stop trying.
A. to solve
B. to be solve
C. solving
D. being solved
答案：
(答案→)A. to solve
B. to be solve
C. solving
D. being solved
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。
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