in one day or two有语法错误吗

in one day or two有语法错误吗 有没有：one day or two in a day or two与in one day or two的区别? in one or two one days or two days,one days or two,one or two day,one and "an or two days""one day or two""one or two days""one and tw one or two words__woring in that sentence in one or two words的中文 in one or two words 的中文 一两天是one day or two还是 a day or two a day or two 与 one day or two 的区别? he will be back one day or two还是a day or two为什么