«El conferenciante insistió en que el cambio climático _____ una realidad incuestionable».

Answer and explanation

Correct answer: A. era

Analysis: 'Insistir en que' when reporting an objective factual truth in the past takes the imperfect indicative ('era'). Answer: era. Why not the others: 'sea' is subjunctive; 'fuera' is imperfect subjunctive; 'sería' is conditional.

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