Answer:
miré
Step-by-step explanation:
Given the context of the sentence, the word must be in past tense and referring to the first person. Mirar conjugated in past tense for first person is miré.
Present Preterite
yo miro miré
tú miras miraste
él/ella/Ud. mira miró
nosotros miramos miramos
vosotros miráis mirasteis
ellos/ellas/Uds. miran miraron