Question

complete the sentence with the correct relative adverb (where, when, or why). last wednesday, i won the golf tournament, was one of the best days of my life.

Explanation:

The sentence is about a past - event on a specific day. The relative adverb 'when' is used to refer to a time. Here, 'Last Wednesday' is a time, so 'when' is the appropriate relative adverb.

Answer:

when