Fill in the blank with a suitable verb form:
A: Why didn't you come to the concert last night?
B: Because I ___________ visit a friend in hospital.
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 is used in the formation of tenses, moods, tones, etc.
Option A is correct as the question and visit indicates the use of had to.
The other options are wrong as no other tense can be used here.
The correct answer is A) had to