高考英语动词时态练习50
题目内容

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

2021-06-22

A.discovered

B.have discovered

C.had been discovered

D.have been discovered

题目答案

试卷相关题目

最新试卷
热门试卷

长理培训客户端 资讯,试题,视频一手掌握

去 App Store 免费下载 iOS 客户端