Not easy as the problem of pollution is____, no one should just stop trying.
A．to solveB．to be solveC．solvingD．being solved
A
考查固定結(jié)構(gòu)。Not easy as the problem of pollution is____,是as引導(dǎo)的讓步狀語從句，是一個倒裝句，正常語序應(yīng)是as the problem of pollution is not easy____結(jié)構(gòu)，考查做某事不容易結(jié)構(gòu)，即be not easy to do 結(jié)構(gòu)，所以選A。
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