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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

 

【答案】

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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