Fill in the blank with the most suitable option:
If you want antibiotics, you _____________ to ask the doctor for a prescription.
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 if and to ask indicate the use of will have.
The other options are wrong as no other form of verb can be used.
The correct answer is C)will have