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 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. in one or two 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？ 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 in a day or two与in one day or two的区别?He will be back in a day or two为什么不能说He will be back in one day or two? 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? 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 hear he will come in_ a .a day or two b.one day or two c.one and two days d.one day or two days 请从语法角度 选择啊正确答案是A 为什么不选b？ 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 The librarian asked him to return the book_____A.in one day or two B.for one or two days C.within one day or two days D.in a day or twoA 和C为什么不对 in one or two words I’m sure that he will be back in ____.A.a day or two B.one day or two C.a or two days D.one or two day选哪个?为什么? He will be all right in __________A one day or two daysB one or two days C one and two days D one or two day 请讲清选什么和理由,并交代清其他选项错误的理由 I‘ll come to see you ___________选B对了吗A .in a day and two B.in a day or twoC.after a day or two D.after one or two days John was ill ,so he had to stay in bed for ( )A.one day and two days B.a or two days C.a day or two D.one and two 一两天是one day or two还是 a day or two