seven -days is right or wrongOn Nation Day,people enjoy a seven-days holiday.

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seven -days is right or wrongOn Nation Day,people enjoy a seven-days holiday.
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seven -days is right or wrongOn Nation Day,people enjoy a seven-days holiday.
seven -days is right or wrong
On Nation Day,people enjoy a seven-days holiday.

seven -days is right or wrongOn Nation Day,people enjoy a seven-days holiday.
应该是seven-days' holiday吧~

错的
应该是seven-day's 连字符“-”,后面不能加复数

On Nation Day,people enjoy a seven-day's holiday

应该是seven-day,我确定!!!