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    精英家教网 > 高中英语 > 题目详情
    -----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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