Dad ,my trousers are old .I want to buy a new _____. a ) trousers b) one c) it d) pair

问题描述:

Dad ,my trousers are old .I want to buy a new _____. a ) trousers b) one c) it d) pair
答案是 d ,但可以选 b 吗

不可以,因为说一条裤子用a pair of