Sentence Correction

not sure why have to pick A, and why "has ever come" is used

i thought the whole sentence is past tense, i picked C for the first time, and D for the 2nd time.

Please kindly explain thanks.

The different tenses give a different meaning to the sentence.

"has ever come" means we're comparing that person's achievement to all other achievements - before him, coincident with him and after him.

All of the other answers use tenses completely in the past, which indicate that we're only comparing his achievements with other past achievements. Those tenses aren't necessarily gramatically incorrect, but changing the meaning of the sentence is against the rules.

Every correct answer needs to satisfy 3 critera. In order of priority:

(1) gramatically correct;

(2) doesn't change the meaning of the original sentence; and

(3) stylistically superior.

Only when the original sentence is nonsensical are we allowed to play with the meaning.

A is the correct answer. As ... as...