Final answer:
The word 'jugo' is the best option to complete the sentence.
Step-by-step explanation:
The most appropriate word to complete the sentence 'Yo tomo mucho de naranja' would be jugo. It translates to 'juice' in English. So the complete sentence would be 'Yo tomo mucho jugo de naranja', which means 'I drink a lot of orange juice'.
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