With the help of high technology, many new substances（物质） in the past years.
A. discovered
B. have discovered
C. had been discovered
D. have been discovered
网友回答
A. discovered
B. have discovered
C. had been discovered
(答案→)D. have been discovered
解析：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。