«Por muy elocuente que fuera su discurso, no _____ a los miembros del jurado».

Answer and explanation

Correct answer: B. convenció

Analysis: In past concessive narrative contexts ('por muy elocuente que fuera'), the factual main clause takes preterite indicative ('convenció'). Answer: convenció. Why not the others: 'convence' is present; 'convencerá' is future; 'haya convencido' is present perfect subjunctive.

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