--Good news.We will have a _______holiday.--I’ve heard of it.But it’s ing in_______.A.three days;three days’ timeB.three days’;three days’C.three-day;three daysD.three days;three-day time
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C解析C 数词+名词作定语的固定句型是“基数词-day/ hour/ minute等+名词”。“一个三天的假期”a three-day holiday；“三天后”in three days，表将来。故选C。