«No aceptaremos ninguna modificación del contrato _____ que esté debidamente justificada por escrito».

Answer and explanation

Correct answer: A. a no ser

Analysis: 'A no ser que + subjuntivo' is the negative conditional connector meaning 'unless it is duly justified in writing'. Answer: a no ser. Why not the others: 'puesto que', 'ya que', and 'dado que' are causal conjunctions governing indicative.

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