I have worn out my shoes,so I want to buy a new ________ .4.I have worn out my shoes,so I want to buy a new ________ .A.pair B.one C.ones D.trousers为什么 a为什么不可以?

问题描述:

I have worn out my shoes,so I want to buy a new ________ .
4.I have worn out my shoes,so I want to buy a new ________ .
A.pair B.one C.ones D.trousers
为什么 a为什么不可以?

ones 这里是指代了shoes
(代替上下文中的名词或名词短语)
I need a pen.Can you lend me one?