Final answer:
To conjugate the verb 'llegar' for the subject 'Yo', the correct conjugation is 'llego'.
Step-by-step explanation:
The verb 'llegar' needs to be conjugated according to the subject 'Yo' (I). In Spanish, when conjugating verbs, you need to remove the ending '-ar' and add the appropriate ending for the subject. For 'Yo', the ending is '-o'. Therefore, the conjugated form of 'llegar' for 'Yo' is 'llego'. So, the complete sentence would be: Yo llego a la oficina del doctor.
Learn more about Conjugating Spanish verbs