had been stumbling
-había estado tropezando
Past perfect progressive conjugation of stumble. There are other translations for this conjugation.

stumble

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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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