It        long before we        the result of the experiment．
A．will not be；will knowB．is；will know
C．will not be；know D．is; know
C
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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