Fill in the blanks with the most appropriate option:-

He is one of the best poets the world ……. ever received.

has

The correct option to fill in the blanks is has.

The sentence is about someone who is considered to be one of the best poets in the world. The verb "receive" is in the present perfect tense, singular form. The auxiliary verb "has" is used to form the present perfect tense of the verb "receive" in the singular form. It is the most appropriate auxiliary verb to use in this context, as it describes the fact that the world has already acknowledged the poet's greatness.

The other options are not as appropriate:

• Have is the present perfect tense, plural form of the verb "to receive". It is not as appropriate as "has", as it does not convey the same sense of singularity or uniqueness.
• Do is the present tense, singular form of the verb "to do". It is not as appropriate as "has", as it does not convey the same sense of recognition or acclaim.
• Had is the past perfect tense of the verb "to receive". It is not as appropriate as "has", as it does not convey the same sense of currentness or immediacy.