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    【题目】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

    【答案】C

    【解析】考查时态。句意：用不了多久我们就会知道实验结果。 It will not be long before. . . 是常用句式, before引导时间状语从句用一般现在时表将来。

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