A piece of shoes ( ).A.is worn out,B.are worn out

A piece of shoes ( ).A.is worn out,B.are worn out a piece of 的用法a piece of good newsa piece of white papera big piece of paper 其中形容词放在piece前还是另一名词前,有什么规律?但a big piece of paper 中big 就放在piece前面了，又如：a new pair of shoes，请问有什 a piece of summer.a piece of a piece of work a blank piece of take a piece of A piece of a piece of a piece of cake a piece of paper A piece of cake a piece of cake a piece of cake a piece of take a piece of a piece of a piece of 为什么 a piece of property