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had been perfecting

  • past perfect progressive
    of perfect.
    perfect
    adjective
    matching in every detail the definition of an ideal type of something.

Example Sentences

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That’s where Messi learned to marry his individual brilliance with the Dutch-infused, team-first style that Barcelona had been perfecting for nearly three decades.

From The Wall Street Journal ● Jul. 18, 2026

For centuries, however, the Chinese had been perfecting the art of papermaking.

From Textbooks ● Apr. 19, 2023

By the time he unvieled the wave for a national television audience, he had been perfecting it for years in smaller venues.

From New York Times ● Oct. 19, 2017

Meanwhile, Mr. Patel’s brother, Preet, had been perfecting the undulating rhythms of ska, dancehall and rock steady with Mr. Terrana.

From New York Times ● Jul. 8, 2016

Soon after his return Champlain broached a plan which he had been perfecting during the voyage.

From Days of the Discoverers by Florence Choate