we have a ___holiday in Spring Festival,填7-day对吗,为什么不是7--days呢

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we have a ___holiday in Spring Festival,填7-day对吗,为什么不是7--days呢
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we have a ___holiday in Spring Festival,填7-day对吗,为什么不是7--days呢
we have a ___holiday in Spring Festival,填7-day对吗,为什么不是7--days呢

we have a ___holiday in Spring Festival,填7-day对吗,为什么不是7--days呢
有连线的,数字后面的词必须要用单数,没有连线的才能加s
8-year-old 也可以说成是8 days
但是前面有了a,就必须要用单数
a 7-day trip

固定搭配…7-day做形容词,七天的

7-day