问题

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

正确答案是：

同类题型

So tired of corn-bread that he eats it with tears in his eyes.

uncertain side effect the medicine will bring about, although about two thousand patients have taken it

He didn’t go to the concert yesterday, did he — . He was busy studying for the tests.

should ____ little Tom for hismistake; after all, he is a child.

Your composition is good _______ some spelling mistakes