问题补充：
- We’ll have a holiday. What about going to the West Lake?
- Sounds great.
A. two days
B. two-day
C. two-days
D. two-days’
答案：
A. two days
(答案→)B. two-day
C. two-days
D. two-days’
解析：英语中国两个或多个单词中间可以用短横线连接起来，起一个相当于形容词的作用，这类单词叫做合成词。其一般构成规则就是其构成单词一般都要用原形。句意:我要有一个两天的假期。去西湖怎么样？故选B。
