Fill in the blank with a suitable verb:
I missed the bus this morning so I _________ walk to school.
A verb is used to express an occurrence, action, or state. It is the grammatical centre of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option C is correct as missed and walk indicate the use of had to.
The other options are wrong as no other tense can be used here.
The correct answer is C) Had to