a year 和one year的区别

a year 和one year的区别 in a year和after a year的区别,用法.. one year have four seasons的语法问题?one year have four seasons和 there are four seasons in a year.的意思有区别吗? one year ago和one year earlier区别?写文章的时候用哪个呢? one year ago和one year earlier区别?写文章的时候用那个好呢? A.one and a half year`sB.a year and a half`sC.one and a half yearD.a year and a half的区别和用法A.one and a half year`sB.a year and a half`sC.one and a half yearD.a year and a half previous year和last year的区别 one year later 跟a year later有什么区别 one year ago 和a year ago 没有任何区别吗?可否说明一下：one 和a 在任何情况下都可以互换的吗? all year round、 all the year round和in a year 还有round 啊year的区别具体一点 a year /one year那个是标准的啊?谢谢 year by year和year after year的区别,专家来 about a year 和nearly a year区别. year by year和year after year有什么区别? year by year 与 year after year 的区别 one year 可以说成 a year all year round 和 all the year round 的区别 last year和next year用法上的区别是什么?