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 一段時(shí)間 before從句。意為：一段時(shí)間以后某事才發(fā)生。Before從句里用一般現(xiàn)在時(shí)代替將來(lái)時(shí)，主句用將來(lái)時(shí)。故C正確。

 

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