within a day or two的意思

within a day or two的意思 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 for a day or two a day or two,one or two days 后面的动词分别用单数还是复数? a day or two的同义短语是什么? 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? a day or two 与 one day or two 的区别?请各位英语高手帮帮忙,详细解答.谢谢! A day or two is enought 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 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? two or three day与two or three day`s time的区别?如题 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 I will stay there for ---------A a day or two B one and two daysC a day and twoD one day or two 并说一下这种词组的固定用法 --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 He will be back in___.A one day or two B one or two days C a day or two days D one point five days 求大神解析下ABC三个的区别 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？