Possible Results:
había engrasado
-I had greased
Past perfect yo conjugation of engrasar.
había engrasado
-he/she/you had greased
Past perfect él/ella/usted conjugation of engrasar.

engrasar

Se constató que la supervivencia de las aves rehabilitadas no difiere significativamente de la supervivencia de las aves a las que nunca se las había engrasado o tratado.
Survival of rehabilitated birds was found not to differ significantly from survival of birds that had never been oiled or treated.
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to season