We must ________ any pollution ________ more happily．


  1. A.
    prevent; from living
  2. B.
    stop; living
  3. C.
    prevent; to live
  4. D.
    keep; living
C
解析：
prevent any pollution阻止污染，注意不要與prevent sb．from doing sth．的結(jié)構(gòu)混淆，該結(jié)構(gòu)中的doing sth．在句中作介詞from的賓語，而to live more happily是目的狀語。
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