She is ( ),but she looks young.A.in her fiShe is ( ),but she looks young.A.in her fifties B.at her fifty C.in her fifty.答案并说明理由!

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She is ( ),but she looks young.A.in her fiShe is ( ),but she looks young.A.in her fifties B.at her fifty C.in her fifty.答案并说明理由!

She is ( ),but she looks young.A.in her fiShe is ( ),but she looks young.A.in her fifties B.at her fifty C.in her fifty.答案并说明理由!
She is ( ),but she looks young.A.in her fi
She is ( ),but she looks young.A.in her fifties B.at her fifty C.in her fifty.答案并说明理由!

She is ( ),but she looks young.A.in her fiShe is ( ),but she looks young.A.in her fifties B.at her fifty C.in her fifty.答案并说明理由!
A in one's +数字,固定搭配,在某人多大年龄的时候,50多岁,用复数

b c 单数形式 a是复数

A
at the age of fifty是指具体的50岁 in one's fifties是指五十多岁,所以是复数