Years ago we didn't know this, but recent science ________ that people who don't sleep well soon get ill．
A.showedB.has shownC.will showD.is showing在线课程B
根据but表示的转折意义判断，后面应说明现在的情况，与几年前相对照，并且空后说明了结果，所以应用现在完成时。
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