Years ago we didn't know this, but recent science study ________that people who don't sleep well soon get ill.
A.showed | B.will show | C.has shown | D.is showing |
相关知识点
推荐套卷
Years ago we didn't know this, but recent science study ________that people who don't sleep well soon get ill.
A.showed | B.will show | C.has shown | D.is showing |