Yearsagowedidn'tknowthis,butrecen

发布时间：2020-07-26 10:38:33

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

网友回答

C解析解析：由于we didn't know this与“现代科技已经证明睡不好觉的人会生病”相互对比，所以this 即指后文的内容，用现在完成时表示对现在的影响．命题立意：本题考查时态．
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