a year /one year那个是标准的啊?谢谢

a year /one year那个是标准的啊?谢谢 one year 可以说成 a year a year 和one year的区别 是a one-year-old boy还是an one-year-old boy 是one year and a half还是a year and a half?为什么? 一年 英语怎么说一年,是 one year 还是 a year一年以前呢,怎么说 ? one year and half 有这个词组吗?看清楚是one year and half而不是one year and a half a year or two 还是one year or two one year later 跟a year later有什么区别 one year ago和one year earlier区别?写文章的时候用那个好呢? on a one-year program是什么意思? Tim is ____boy.He can say a few words.A.an one-year-old B.a one-year-old C.an one-year oldD.a one-year old a one-year program什么意思 One （ ）year is a century contract:one year with a possibility to one year and a half 后应该是接单数形式吧?比如one year and a half has passed.不是one and a half years 是one year and a half When did you see the boy?One year beforeOne year ago选那个为什么 那个year不知道是哪个音标,