It _______ long before we ______ the result of the experiment.
A．will not be; will knowB．is; will knowC．will not be; knowD．is; know
C
考查時(shí)態(tài)。句意：我們知道實(shí)驗(yàn)結(jié)果不會太久。主句為一般將來時(shí)的句子中，從句用一般現(xiàn)在時(shí)表示將來的動作，故選C。
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