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    精英家教网 > 高中英语 > 题目详情
    With the help of high technology, more and more new substances ______ in the past 10 years.
    A．discoveredB．have discovered
    C．had been discoveredD．have been discovered
    D
    考查时态。in the past+时间段，后用现在完成时态。句意：在先进技术的帮助下，在这十年间越来越多的新物质被发现。故选D。
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