-----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

 

D

【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(rèn)為人類(lèi)還要多久才能解決癌癥問(wèn)題？——嗯，那還得看情況。故D正確。

考點(diǎn)：考查連詞

 

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