问题补充:
They have clothes
A. at good price
B. at a good price
C. in good price
D. in a good price
答案:
A. at good price
(答案→)B. at a good price
C. in good price
D. in a good price
解析:at表示在一点;in表示在一个范围。句意:他们有一种价格不错的衣服。本句中价格是可数名词,意思是一种价格,价格是数目上的一点,用介词at,故选B。