这里 用is 还是 are 1 There is / are 4 days' holiday in a month.2 There is / are a 4-day holiday in a month 1 2 两句中谓语 动词 ,应该用那个?觉得是不是 用 单数 IS 3,He is a 7 years old boy 有冠词 a 应该是 因为后面是

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