题目内容
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 |
A
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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