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If we all make a contribution to ________ the environment, the world will become much more beautiful.


  1. A.
    protecting
  2. B.
    protected
  3. C.
    protect
  4. D.
    protects
A
点拨:此题考查to的不同用法。make a contribution to是“为……做贡献”,to是介词,其后接名词、代词或动名词。只有A符合此用法。
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