有没有：one day or two

有没有：one day or two in one day or two有语法错误吗 an or two daysone day or twoone or two daysone and two days请说明这些词组的用法及语法,最好附上语句.并说明哪些用法有,哪些用法没有.尽快!其它都没有这样的写法？one or two 用法呢？语法呢？ 英语中a 和one有什么区别?例如my friend will return in _____.A.one day or two B.a day or two C.one or two day这题选择B谁能给解释下. 一两天是one day or two还是 a day or two 一两天 是a day or two 还是one day or two he will be back one day or two还是a day or two为什么 The biologist has been here for ______.A.one day or two B.one or two days C.a day or two days D.one and two days答案是选B的,可是我觉得A,C也可以啊,请问这是为什么啊?英语书上有这样的用法a tear or two =one or two tears It will take us ____to finish the workA.a day or two B one or two day C a day and two D one or two days.为什么? --How long will you stay there?--For__.A.one and two days B.one and two day C.one or two day D.a day or two 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？ a day or two,one or two days 后面的动词分别用单数还是复数? 单选You can return the book in _____.You can return the book in _____.A one or two day B one day or two C a day or two D one day or two days为什么? They will finish the work______A.after one and two days B.after one or two days C.in one and two days D.in one day or two one and two days,one day or two ,one to two days,这样的表示都正确吗? 这道题的两个选项有什么区别We can finish the work in ______ .A.a day or two B.one or two days you will have to spend_writing your report herea.one day or two days b.one day or two c.a day or two d.two days or one答案是c 为什么 You'll have to spend ----writing your report here A.one day or two days B.one day or two C.a day or two .D.two days or one 为什么