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It _______ long before we ______ the result of the experiment.
A.will not be; will knowB.is; will knowC.will not be; knowD.is; know
C
考查时态。句意:我们知道实验结果不会太久。主句为一般将来时的句子中,从句用一般现在时表示将来的动作,故选C。
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