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新概念英语2册56课问题

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新概念英语2册56课问题
1.once a year,a race is held for old cars.
请问能否把a去掉改成:once a year,race is held for old cars.为什么?
2.old car race is held ones a year.
请问能否加个an改成:an old car race is held ones a year.为什么?
新概念英语2册56课问题
Once a year ,a race is held for old cars.每年举行一次旧式小汽车比赛.去掉a,不能强调"一次".
Old car race is held Once a year .一年一度举行老式汽车竞赛.加an 强调这款“老式汽车竞赛”.
以上几种说法没有语法错误,表达意义略有差别,请仔细体会.