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don'tshoutathim.heisonlyaneightdon'tshoutathim.heisonlyaneightyearsold正确选aneightyearold为什么选它

题目详情
don't shout at him.he is only an eight
don't shout at him.he is only an eight years old 正确选an eight year old 为什么选它
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答案和解析
如果没有冠词an,原句子he is only eight years old是正确的,但这里eight year old 是作形容词,意思是八岁大的,所以year不能用复数.