Final answer:
The best Spanish word to complete the sentence is 'hablándoles', which means 'talking to them'.
Step-by-step explanation:
The best Spanish word to complete the sentence is hablándoles.
In this case, the correct choice is the verb 'hablándoles', which means 'talking to them'. It is the gerund form of the verb 'hablar', which means 'to talk'.
For example, the sentence 'La maestra está hablándoles a los estudiantes' translates to 'The teacher is talking to the students'.
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