Final answer:
The sentence is incorrect as written. The correct sentence would be 'Carlos le prometió una nueva casa a Lucy.'
Step-by-step explanation:
The sentence is incorrect as written. The correct sentence would be 'Carlos le prometió una nueva casa a Lucy.' In Spanish, when referring to someone who is receiving something, the indirect object pronoun 'le' is used. Therefore, the correct sentence would be 'Carlos le prometió una nueva casa a Lucy.'
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