Fill in the blanks with the most appropriate words.
I know he reads every book I ___ ever ___ of.
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 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 C)have/heard