华为架构师:——Dad, when will you be free? You agreed to go to the seaside with me four days ago.英语题

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——Dad, when will you be free? You agreed to go to the seaside with me four days ago.
——I'm sorry,Jean. But me I think I will bave a ______holiday soon.
A. four-days B. four-day
C.four days D.four day
应该选什么?为什么?请指教!

B four-day 可以当作一个词看待