Question

Not easy as the problem of pollution is______, no one should just stop trying.

1. A.
   to solve
2. B.
   to be solve
3. C.
   solving
4. D.
   being solved

Answer 1

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。