问题补充：
With the help of high technology, more and more substances in the past years.
A. discovered
B. have discovered
C. had been discovered
D. have been discovered
答案：
A. discovered
B. have discovered
C. had been discovered
(答案→)D. have been discovered
解析：考查时态和语态。本题的关键是时间状语in the past years，该时间状语通常与现在完成时连用。既要：在高科技的帮助之下，在过去几年里越来越多的物质被发现了。根据惊句意说明使用被动语态的形式。故D正确。
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