«Tan pronto como los delegados _____ a un acuerdo, se emitirá un comunicado oficial».

Answer and explanation

Correct answer: D. lleguen

Analysis: 'Tan pronto como' referring to a future action requires the present subjunctive ('lleguen'). Answer: lleguen. Why not the others: 'llegan' is present indicative; 'llegarán' is future indicative; 'llegaban' is imperfect indicative.

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