How many hours do you sleep every night 中night为什How many hours do you sleep every night 中night为什么不是复数?

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How many hours do you sleep every night 中night为什How many hours do you sleep every night 中night为什么不是复数?
How many hours do you sleep every night 中night为什
How many hours do you sleep every night 中night为什么不是复数?

How many hours do you sleep every night 中night为什How many hours do you sleep every night 中night为什么不是复数?
因为有了how many 所以就不用负数了