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    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

    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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