问题
选择题
We’ll have a _______holiday. What about going to the Great Wall?
A．three days
B．three-day
C．three-days
D．three-days’
答案
答案：B
句意为我们将有一个三天的假期，去长城怎么样？三天的假期应表达为have a three-day holiday ，three-day 为复合形容词，连字符之间应用单数形式。所以选B 。