Final answer:
The Spanish word that best completes the sentence 'My mother likes ___ milk at the store' is 'comprar'.
Step-by-step explanation:
The Spanish word that best completes the sentence 'My mother likes ___ milk at the store' is comprar. 'Comprar' means 'to buy' in English. The sentence would then read 'Mi madre le gusta comprar leche en la tienda.'
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