第一个不加 a 的话，就不行，必须加,因为 three-day这种表示的话就相当于一个形容词（三天的）来形容holiday，holiday又是可数名词，所以必须有冠词。翻译如下： 2 I think it's too short for just 3 days holiday,so I didn't have an urge to travel.3 It's great that you've got 3 days holiday at least. For we cann‘t get the day off work and we need to work overtime.4 How was your three days‘ holiday ?5 where do you plan to go during the three-day hoday ?6 where would you like to go if you have a （long）holiday ?最好采纳吧，嘿嘿嘿
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