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    14、With the help of high technology, more and more new substances            in the past years.

    A．discovered

    B．have discovered

    C．had been discovered

    D．have been discovered

    14、 D

    解析：  由句中的时间状语in the past years可知，空格应填现在完成时；又因句子中的主语new substances与discover为被动关系，故选D项。

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