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With the help of high technology.more and more new substances in the past years.

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With the help of high technology.more and more new substances in the past years.

With the help of high technology，more and more new substances in the past years.?

A.discovered B.have discovered?

C.had been discovered　 D.have been discovered

 

试题答案

D

 

in/during the past years所在句子要用现在完成时态，substances是“被发现”，故用被动形式。

 

标签：technologyhighandmorethe

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