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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 few years.
    A．discovered B．have discovered
    C．had been discoveredD．have been discovered
    D

    试题分析：考查时态。根据时间状语in the past few years,说明使用现在完成时。根据句意说明使用被动形式。句意：因为有高科技的帮助，早最近几年中，越来越多的物质已经被发现了。故D正确。
    点评：对于时态的考查要从关键词着手，也要在语境中进行。
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