Fill in the blank with a suitable option:
His illness got worse and worse. In the end he _________ go into hospital for an operation.
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 C is correct as in the end indicates 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