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It _____ long before we _____ the result of the experiment.          

  A. will not be; will know          B. is; will know    

  C. will not be; know              D. is; know

C


解析:

考查时间状语从句中的时态和逻辑。当before用在It (will) be +一段时间+before从句这一结构中时,翻译成“要不了/没有多久就会”,本题就是这个结构,主句是将来时,before从句中应该是一般现在时表示将来时。

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