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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:句意:你认为还要多久人才能最终解决癌症的问题。--那要看情况而定了。这句话用了It will be+一段时间+before从句,意思是“还要多久…才/就….”,选D。
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