You should sleep_______nine hours every nighta.in b.with c.at d.for

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Youshouldsleep_______ninehourseverynighta.inb.withc.atd.forYoushouldsleep_______ninehourseverynighta

You should sleep_______nine hours every nighta.in b.with c.at d.for
You should sleep_______nine hours every night
a.in b.with c.at d.for

You should sleep_______nine hours every nighta.in b.with c.at d.for
D是表示一段时间
in nine hours 是九个小时内所以A不对

睡九个小时 D

d for后面加时间

D

d.for

d