Final answer:
The best Spanish word to complete the sentence is recibiste.
Step-by-step explanation:
The best Spanish word to complete the sentence is recibiste. The sentence would then read Tú recibiste un diploma la semana pasada. The correct form of the verb recibir (to receive) for the subject tú (you) in the past tense is recibiste. The other options, Orecibimos, Orecibio, and Orecibieron, are not the correct conjugations for the subject tú in the past tense.
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