Fill in the blanks with the most appropriate words.
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 ever indicates the use of present perfect tense.
The other options are wrong as no other tense can be used here.
The correct answer is E)have /heard