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英语问题1.in a single day2.on a single dayWhich is right and why

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英语问题
1.in a single day
2.on a single day
Which is right and why? Thanks.
英语问题1.in a single day2.on a single dayWhich is right and why
In a single day 对.
请看英汉词典的例句:
in a day 一日,一朝一夕. in broad day 在大白天. in days gone by = in days of old [yore] 在从前,已往. in days to come 将来,后世. in one's day 年轻时候;在旺盛的时候. in our days 如今,目下. in those days 当时,那时候.