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    With the help of high technology, more and more new substances ______ in the past years.
    A．discoveredB．have discovered
    C．had been discoveredD．have been discovered
    D
    时态和语态。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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