___of them felt very tried but quite happy after___sports meeting

题目

___of them felt very tried but quite happy after___sports meeting
A.Every one ; the two days B.Every one ; the two-days
我选的是A,是错误的.为什么错?
答案B为什么是对的?

答案

the two-days
有连词符号表示two-days为形容词,意思是：为期两天的运动会