The little boy can tell stories ()the age of 3.()中写in,on,at

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The little boy can tell stories ()the age of 3.()中写in,on,at

The little boy can tell stories ()the age of 3.()中写in,on,at
The little boy can tell stories ()the age of 3.
()中写in,on,at

The little boy can tell stories ()the age of 3.()中写in,on,at
答案是 at
at the age of 3 = 3 岁,在3 岁时,早在 3 岁
at 是这个短语的固定介词.
The little boy can tell stories (at) the age of 3.
这孩子3 岁就会讲故事.
希望帮到了你,

at