64.

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

The former sentence "Einstein is often regarded as the most original scientist" and the latter sentence "he admitted that he relied on the work of others". It can be seen that the two sentences are a concession relationship.

Item G: "Although he admits..." is in line with the relationship between sentences.

Item H: Error, the tenses of the preceding and following sentences are inconsistent, and it is impossible to happen at the same time.