We had a __________ holiday last week.

问题描述:

We had a __________ holiday last week.
A.three days B.three-days C.three-day D.three day
为什么用A不可以?和a five years old boy不是一样的么?

three-day 可看作是一个复合形容词,可修饰名词holiday .至于a five years old boy这个短语,它本身就是错的.我们一般用a five-years-old boy.至于five years old 我们一般用he is five years old.它等于he is a five-...