It ’s our duty to______people______too many trees.


  1. A.
    stop; cutting down
  2. B.
    prevent, to cut down
  3. C.
    keep; cutting down
  4. D.
    make; cut down
A
stop/ prevent sb from doing sth,阻止某人做某事,from可省略。Keep sb from doing sth,from不可省。因此選A。
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