为什么a two-week中间有个横线?回答要简短,语言表达清晰!

为什么a two-week中间有个横线?回答要简短,语言表达清晰! Two days a week have a headache 为什么中间有个a?headache once a week 有one time a week 吗?为什么? Every year I have___holiday.A:a two-week B:two weeks C:two-week D:two week's 英文单词中横线的用法1.they had finished （end-of-year） exams last week 2.two-year-old3.two-meter-tall boy像这种句子中,什么时候用横线,怎么用,有什么规律,常见到这种题 I will give you ( )to finish.A.two weeks' time B.two-week time 答案是A为什么 英语一道选择填空题Mum,how about spending( )holiday in Hawaii(夏威夷）?A.a two-weeksB.two-weekC.two week'sD.a two-week选什么?为什么?C为什么不行? － How soon will you finish reading the book? － In _____ . A. one or two weeks B. one week or two C. a week or two D. a or two weeks为什么选A捏 two weeks' time为什么要有“ ’”two weeks'time two week's time two weeks time有什么不一样?哪一个是对的? 为什么说 two week's time 和 a two weeks' holiday 's和s'究竟区别什么? 桌子底下有两个球和一只猫 用英语怎么说two balls and a cat 横线横线 the table 桌子底下有两个球和一只猫 用英语怎么说two balls and a cat 横线横线 the table twice a week 与 there times a week有区别吗为什么两次（两次以下）与三次（三次以上）表达形式少个time 有个符号(笔记本键盘),一个C,中间两条横线,怎么读 网名中间加横线看好喔,是在网名中间不是下划线.最好有个教程好吗么么哒 A two-week holiday =two weeks' holiday? 为什么看电影会出现两个画面》?中间有一道绿色的横线.