By the time I had reached the bottom of the mountain, I ..... extremely tired.

By the time I had reached the bottom of the mountain, I ..... extremely tired. (*) feel (*) have felt (*) felt (*) am feeling


This is a companion discussion topic for the original entry at https://english.best/questions/5725,by-the-time-i-had-reached-the-bottom-of-the-mountain-i-___-extremely-tired/