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问题: a和one

They said that they would leave for Beijing___.
A in a day or two
B in one day or two
给我讲一下a和one的区别吧

解答:

They said that they would leave for Beijing_A__.
A in a day or two
B in one day or two


英语中,
表示:一天,一小时,一分钟时,大都用:a day,an hour...也有用one的,但是较少


one day:主要是“某一天”的意思


供参考