he moved to america with his parents----------Ain his teens Bin his tens选什么?为什么?

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he moved to america with his parents----------Ain his teens Bin his tens选什么?为什么?
he moved to america with his parents----------
Ain his teens
Bin his tens
选什么?为什么?

he moved to america with his parents----------Ain his teens Bin his tens选什么?为什么?
选A.
in one's teens,表示“十几岁”,
in one's twenties,表示“二十几岁”
另外,这两个词组都可以有下列表示方法,
其他年龄段也可以用这种表达方法.如,
thirties,forties,fifties,sixties,seventies,eighties,nineties.
---------
没有用tens来表达十几岁的 .

in one's +数词的复数形式,在某人多少岁的时候。比如这里就是说在他十几岁的时候

b

选a,
teens是青少年的意思