Question

We'll have a ___ holiday.What about going to the Great Wall?

A three days
B three-day
C three-days
D three-days'

Answer 1

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

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Answer 2

选择B three-day。three days也表同样意思，但因为选项前有a所以后面要用单数。

Answer 3

B。 句中用了a, 后面需跟单数，唯有B是单数。

Answer 4

选B three-day 可以作定语修饰后面的名词，带连字符时名词不能用复数，规律！

Answer 5

B 就像 an eight-year-old girl 一样的用法