had bettered
Past perfectconjugation ofbetter.There are other translations for this conjugation.

better

After an eight-year retirement from this sport, he had bettered his own record by more than seven feet while preparing for the Moscow games.
Después de ocho años de retiro de este deporte, había mejorado su propio récord en más de siete pies mientras se preparaba para los juegos de Moscú.
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