had been stumbling
-había estado tropezando
Past perfect progressiveconjugation ofstumble.There are other translations for this conjugation.

stumble

Even the other members of the Sun Knight Platoon looked at Adair with eyes of admiration, especially Ed who had been stumbling over his words and couldn't even say half a sentence.
Hasta los otros miembros del Pelotón del Caballero Sol miraron a Adair con ojos llenos de admiración, en especial Ed, quien tartamudeó una y otra vez y ni siquiera pudo decir media frase.
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