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    精英家教网 > 高中英语 > 题目详情
    With the help of high technology, many new substances（物质）______in the past years.
    A．discoveredB．have discoveredC．had been discoveredD．have been discovered
    D
    考查时态语态：时间是in the past years.时态用现在完成时，new substances和discover是被动关系，句意是：随着高科技的发展，在过去的这些年里，很多新的物质被发现了。选D。
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