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how old is the old woman i think she is

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how old is the old woman i think she is
A.70-year-old B.70 years
C.70 year old D 70 years old 说下为什么
70-year-old用于名词前面作定语,如He is a 70-year-old man.
70 years old常用作表语,如He is 70 years old.