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
网友回答
A. will not be; will know
B. is; will know
(答案→)C. will not be; know
D. is; know
解析: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。