Final answer:
The appropriate form of the verb 'traducir' in the given sentence is 'traduje'.
Step-by-step explanation:
In the sentence, 'El año pasado, yo traduje un libro de poemas del francés al español,' the appropriate form of the verb 'traducir' is 'traduje' which is the past tense of the verb. This form is used to indicate that the action of translating the book from French to Spanish was completed in the past.
Learn more about verb conjugation in Spanish