Fill in the blank with a suitable option:
He __________ take his medicine three times a day. The doctor told him to.
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 three times a day indicates the use of has to (to suggest compulsion and necessity)
The other options are wrong as no other tense can be used here.
The correct answer is A)has to