Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill.(4.0分)<br>A: showed<br>B: has shown<br>C: will show<br>D: is showing

Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill.(4.0分)
A: showed
B: has shown
C: will show
D: is showing

出自：武汉科技大学英语2

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