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求一英语单选we are going to have a ________ holiday on May

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求一英语单选we are going to have a ________ holiday on May
A.three days' B.three days C.three-day D.three day
求答案+解释(主要是A和C.)
C.three-day 正确.
两个(或以上)词中间有连字符“-”才能作定语.
另例:
an eight-year-old girl
如果是所有格形式,则前面没有冠词,即
We are going to have three days' holiday on May.