had been tutoring
Past perfect progressiveconjugation oftutor.There are other translations for this conjugation.

tutor

His first mathematics paper, written jointly with Fekete the assistant at the University of Budapest who had been tutoring him, was published in 1922.
Su primer papel de las matemáticas, Fekete escrita conjuntamente con el asistente en la Universidad de Budapest, que había sido él tutoría, se publicó en 1922.
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