—How long do you think it will be______ man can finally solve the problem of cancer?
—Well，it depends
A．whenB．untilC．a(chǎn)fter D．before
D

試題分析：考查連詞：句意：你認為還要多久人才能最終解決癌癥的問題。--那要看情況而定了。這句話用了It will be+一段時間+before從句，意思是“還要多久…才/就….”，選D。
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