Final answer:
The word that completes the phrase is "como" which means "I eat".
Step-by-step explanation:
The word that best completes the phrase "sándwich de queso y jamón" is "como". This word means "I eat" in English. So the complete phrase would be "Yo siempre como sándwich de queso y jamón", which translates to "I always eat a cheese and ham sandwich". The word "como" is used to describe the action of eating the sandwich.
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