Itlongbeforewetheresultoftheexperiment．
A.will not be；will knowB.is；will knowC.will not be；knowD.is; know在线课程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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