Don't promise anything ________ you are one hundred percent sure.


  1. A.
    whether
  2. B.
    after
  3. C.
    how
  4. D.
    unless
D
考查連詞的用法。unless意為“除非，如果不”。全句意為：除非你有百分之百的把握，否則不要作出任何承諾。whether意為“是否”，after意為“以后”，how意為“怎么樣”。A項(xiàng)干擾性較強(qiáng)，本題較易。
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