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急~Thisismycousin.Heis10monthold.已改错,请解释急~Thisismycousin.Heis10monthold.正确改错:month+s,解释说明为什么这样改?谢谢

题目详情
急 ~ This is my cousin. He is 10 month old. 已改错,请解释
急 ~ This is my cousin. He is 10 month old. 正确改错:month+s,解释说明为什么这样改?谢谢
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答案和解析
与此相同 How old are you?I am ten years old.10复数 so,He is 10 months old.