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It        long before we        the result of the experiment.


  1. A.
    will not be;will know
  2. B.
    is;will know
  3. C.
    will not be;know
  4. D.
    is; know
C
解析:
考查固定句型。It be 一段时间 before从句。意为:一段时间以后某事才发生。Before从句里用一般现在时代替将来时,主句用将来时。故C正确。
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