Enough attention has been paid ________ our economic environment.


  1. A.
    to improve
  2. B.
    to improving
  3. C.
    to be improved
  4. D.
    for improving
B
試題辨析
本題考查某一詞組的用法．pay attention to后需接名同或動(dòng)同的ing形式．因此答案為B．
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