Final answer:
The correct phrase that completes the sentence is 'il y a douze ans'.
Step-by-step explanation:
The correct phrase that completes the sentence is il y a douze ans. This phrase translates to 'twelve years ago' in English. Since the year is 2012 and the person was born in 2000, 12 years have passed. Therefore, the correct phrase is 'il y a douze ans'.
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