问题
选择题
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
答案
答案:D
考查时态。“几年前,我不知道这件事,但最近的科学正在表明,睡眠不好的人容易得病。”用进行时