I'll be back in __________a one day or twob a day or twoc a or two daysd one day or two days选哪个?为什么?

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I'll be back in __________a one day or twob a day or twoc a or two daysd one day or two days选哪个?为什么?
I'll be back in __________
a one day or two
b a day or two
c a or two days
d one day or two days
选哪个?为什么?

I'll be back in __________a one day or twob a day or twoc a or two daysd one day or two days选哪个?为什么?
b.a day or two ( a day or two 己是一固定用法了) 如 a month or so,a year or two)

a day or two=one or two days
所以选A

A