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my grandma is already A.80-year-old B.80 years oldmy grandma is already_________ A.80-year-old B.80 years old选哪个为什么

题目详情
my grandma is already A.80-year-old B.80 years old
my grandma is already_________ A.80-year-old B.80 years old选哪个为什么
▼优质解答
答案和解析
答案是B.80 years old
而A.80-year-old 只能作定语,如 anA.80-year-old woman