问题

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

正确答案是：

同类题型

Is this _______ pencil case–No, it’s ______ eraser．

Her advice is very good. So I_____ agree with her..

Excuse me, Jack. What’s this in English–It’s _______ eraser.

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Had she _____ her promise, she would have made it to Yale University. [ ]