the pair of jeans is expensive .do you have _____ a) cheaper one b) a cheaper pair c) cheaper one

问题描述:

the pair of jeans is expensive .do you have _____ a) cheaper one b) a cheaper pair c) cheaper one
b ,可为何不选c 呢.说明原因

因为jeans是牛仔裤,裤子本身就有两条腿,只能与a pair of 搭配,不能与a 搭配,
就和a pair of shoes(一双鞋子),a pair of trousers(一条裤子)是一样的道理