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-----How long do you think it will be _____man can finally solve the problem of cancer?
------Well.it depends.
A.whenB.untilC.after D.before
D

试题分析:考查连词。本题考查it will … before …还有多久才能……。句意:——你认为人类还要多久才能解决癌症问题?——嗯,那还得看情况。故D正确。
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