注意:此页面搜索的是所有试题
题目内容
(云南工商学院-生活英语听说)
[单选题,10分] Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill.
A.showed
B.has shown
C.will show
D.is showing
A.showed
B.has shown
C.will show
D.is showing
参考答案