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The little boy can tell stories ()the age of 3.

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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.
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.
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