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-----How long do you think it will be _____man can finally solve the problem of cancer?

------Well．it depends．

A．when B．until C．a(chǎn)fter D．before

【解析】

試題分析：考查連詞。本題考查it will … before …還有多久才能……。句意：——你認為人類還要多久才能解決癌癥問題？——嗯，那還得看情況。故D正確。

考點：考查連詞

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