Years ago we didn ’t know this, but recent science ( ) that people who don ’t se ep well soon get ill.A.showedB.has shownC.will showD.is showing
Years ago we didn ’t know this, but recent science ( ) that people who don ’t se ep well soon get ill.
A.showed
B.has shown
C.will show
D.is showing
相关考题：
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