[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.<br>A.showed<br>B.has shown<br>C.will show<br>D.is showing

[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

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