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5. C【解析】本题考查“数词+连字符+名词”作定语的用法。We have a 3-day holiday every National Day. = We have a 3 days’ holiday every National Day. 所以此题选C。句意：每年国庆节我们有三天假期。
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5. C【解析】本题考查“数词+连字符+名词”作定语的用法。We have a 3-day holiday every National Day. = We have a 3 days’ holiday every National Day. 所以此题选C。句意：每年国庆节我们有三天假期。