had been concealing
-había estado ocultando
Past perfect progressiveconjugation ofconceal.There are other translations for this conjugation.

conceal

Nay, it has become manifest to them what they had been concealing before.
Pero ¡no! Se les mostrará claramente lo que antes ocultaban.
Following this incident, other members of Parliament reacted angrily as if the Defense Minister had been concealing the fact that this is a war from them. (Washington Post, September 8)
Después de este incidente, otros miembros del parlamento reaccionaron enfadados como si el ministro de Defensa les hubiera estado ocultando el hecho de que ésta es una guerra (The Washington Post, 8 de septiembre de 2009).
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