52单词网 > 高中英语 > 高中英语题库 > 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.

来源：网络 时间：

推荐文章

解开绳结用英语怎么说
热度：
专一英语怎么说
热度：
Q5后视镜调节电机英文翻译
热度：
730上学英语怎么说
热度：
This coastal area a national wildlife reserve last...
热度：
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

 

标签：technologyhighandmorethe

相关推荐

相关热搜

猜你喜欢