Years ago we didn't know this, but recent science study ________that people who

题干

Years ago we didn't know this, but recent science study ________that people who don't sleep well soon get ill.

A．showed

B．will show

C．has shown

D．is showing

上一题下一题 0.64难度单项选择更新时间:2013-10-10 02:33:59

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