Final answer:
The verb form that correctly completes the sentence is 'compartíamos'.
Step-by-step explanation:
The correct verb form to complete the sentence is compartíamos.
The sentence is in the past tense and the verb form 'compartíamos' is the correct conjugation of the verb 'compartir' for the subject 'we'.
Therefore, the correct answer is Option C: compartíamos.
Learn more about Spanish verb conjugation