most students sleep _ than 9 hours every night .这里为什么填less 而

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most students sleep _ than 9 hours every night .这里为什么填less 而不是fewer 小时不是可数名词么

时间,距离即使接动词都是单数
比如
9 hours (has) passed.
It (is) about 10 miles from here.
而且less than 可数不可数都可以用
fewer than 除非是1-5个之内,不然基本上不用（属于比较冷门的用法,当然如果你课文里面有的话,它的相同类型,你还是可以用的）
不过（fewer than 一直是冷宫短语.）

most students sleep _ than 9 hours every night .这里为什么填less 而 People who sleep ___ six hours a day.是填fewer than还是less than There are less than 50 students in our class.这里为什么不用fewer而用l The old man needs at most five hours' sleep a night,but he _ I sleep for nine hours every night He doesen‘t sleep more than 10 hours every night的同意句 1.—_____ _____hours do most students sleep every night?(根据答语 eight hours' sleep a night=Eight hours of sleep every night吗 we need to sleep eight or nine hours every night.为什么need后加to I never sleep for less than nine hours.中文是什么? 句型转换就一题I sleep eight hours every night 画线部分为eight 对它提问____ _ sleep nine hours every night.(对划线部分提问)