at half a price/at half price/at a half price哪个是对的哪个是错的...为什么

in half a price还是 at half a price? at half a price/at half price/at a half price哪个是对的哪个是错的...为什么 buy with OR at?I bought rhese jeans___in the sale.A with low price B at half price at a price at a price同义词 at a good price only students can get it at half price. 同义句 you can get it at half price ——— —— a student 半价用英语是at a half price 还是没有a be assessed at a price 价格合理是at a good price还是at good price 请问at a price of & at the price of 问一个简单的英语用法.I bought a pair of shoes_____a.at the half priceb.at half the price这应该是属于一个用法问题 ·· I hear you bought a new car last month.How much did it cost you?1000 dollars,_______I've sold it already,however.A)at half of which B)at half price C)at half D)which 是at a low price 还是in a low price at a good price 还是 for a good price at a very good price怎么使用? advertise at a low price可以吗 at a very good price翻译