题目内容：

We'll have a ___ holiday.What about going to the Great Wall?
A three days
B three-day
C three-days
D three-days'

优质解答

应该是：
B
我们将有一个三天的假期,去长城如何?
三天的假期,有两种表达方式
three days' holiday
three-day holoday
所以选B