With the help of high technology, more and more new substances in the past 10 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。in the past+时间段，后用现在完成时态。句意：在先进技术的帮助下，在这十年间越来越多的新物质被发现。故选D。