i could sing the song when i was5.同义句是什么?

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i could sing the song when i was5.同义句是什么?
i could sing the song when i was5.同义句是什么?

i could sing the song when i was5.同义句是什么?
I could sing the song at the age of five ( at age 5).

i am able to sing the song when i was at the age of 5