题目内容

Years ago we didn't know this, but recent science study ________that people who don't sleep well soon get ill.
A．showedB．will showC．has shownD．is showing
C

试题分析：考查时态，句意：多年前，我不知道这个，但是最近的研究表明睡眠不好的人很容易生病。句中的recent 可知应用现在完成时。选C。
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