Question

The success that he has gained, though striking enough, does not, however, commensurate . . . the efforts made by him.

Answer 1

The word to be filled in the blank is - 'with'.

The corrected statement is - The success that he has gained, though striking enough, does not, however, commensurate 'with' the efforts made by him.

When the adjective 'commensurate' is used as a third-person singular simple present, it is always accompanied by a 'with'.

Answer 2

Answer: with

Explanation:  The success that he has gained, though striking enough, does not, however, commensurate  with

the efforts made by him.