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    We    on it for several hours but we haven't yet reached any conclusion.
    A．are workingB．workC．have been workedD．have been working
    D

    试题分析：考查时态。for+一段时间，与完成时连用，排除A、B；we与work是主谓关系，不应该使用被动语态，排除C；现在完成进行时可以表示动作有可能继续下去。句意：我们已经讨论了几个小时，但还没有达成任何结论。讨论有可能继续下去，用现在完成进行时较好，故选D。
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