«No podemos proceder a la firma del contrato a menos que ambas partes _____ conformes».

Answer and explanation

Correct answer: D. estén

Analysis: 'A menos que' always governs the subjunctive ('estén'). Answer: estén. Why not the others: 'están' is present indicative; 'estuvieron' is preterite indicative; 'estarán' is future indicative.

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