Final answer:
The preterite form of the verb 'llamar' in the yo (I) form is 'llamé'.
Step-by-step explanation:
The sentence should be completed using the preterite form of the verb llamar. In the yo (I) form, the preterite of llamar is llamé. Therefore, the sentence should be: Yo te llamé anoche.
Learn more about preterite verb conjugation