Fill in blank (131) with the most suitable option:
A verb is used to express an occurrence, action, or state. It is the grammatical center of the predicate in a sentence.
An auxiliary verb is a verb which is used in the formation of tenses, moods, tones, etc.
Option B is correct as but indicates the use of not with the helping verb (did) which suggests of past tense.
The other options are wrong as no other tense can be used here.
The correct answer is B)didn't have to.