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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

試題分析：考查時(shí)態(tài)，句意：多年前，我不知道這個(gè)，但是最近的研究表明睡眠不好的人很容易生病。句中的recent 可知應(yīng)用現(xiàn)在完成時(shí)。選C。
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