______, we should sleep at sleep at least 8 hours a day, but in practice we slee

题干

______, we should sleep at sleep at least 8 hours a day, but in practice we sleep less than that.

A．In fact	B．In theory
C．On average	D．In particular

上一题下一题 0.65难度单项选择更新时间:2017-08-15 12:02:59

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