Final answer:
The correct verb form to complete the sentence is 'compartíamos'.
Step-by-step explanation:
The correct verb form to complete the sentence is compartíamos. The sentence translates to 'Every time we stayed in hostels, we shared a room with many other students.' Since the subject 'we' is plural, we need to use the verb form that matches the plural subject, which is 'compartíamos'.
Learn more about Verb conjugation in Spanish