With the help of high technology, more a...

With the help of high technology, more and more new substances ___in the past few years.

A．discovered	B．have discovered
C．had been discovered	D．have been discovered

D 【解析】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。考点：考查时态

考点分析：

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