a bad habit is formed, it will take a long time to get rid of it．


  1. A.
    Ever since
  2. B.
    While
  3. C.
    Once
  4. D.
    Even if
C
解析：
考查連詞的用法。句意：一旦壞習(xí)慣形成，它要花好長一段時間才能擺脫。Once 一旦。故選C。
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