Question

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

Answer 1

D

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。