Had fallen.
Existed is the past tense. The past perfect tense is had existed.
The past tense is bled, and the past perfect tense is had bled.
The past tense of sit is sat; the past perfect tense is had sat.
The present perfect tense of fell (to knock, strike, or cut something down) is have felled. Fell is also the past tense of fall. The present perfect tense of fall is have fallen.
The past perfect tense is had submitted.
Existed is the past tense. The past perfect tense is had existed.
The past tense is bled, and the past perfect tense is had bled.
The past tense of sit is sat; the past perfect tense is had sat.
The present perfect tense of fell (to knock, strike, or cut something down) is have felled. Fell is also the past tense of fall. The present perfect tense of fall is have fallen.
The past perfect tense of hope is had hoped.
The past perfect tense is had submitted.
The past perfect tense is had chosen.
The past perfect tense is "had confronted".
The past perfect tense is had set.
The past perfect tense is had burned.
The past perfect tense is had rung.
The past perfect tense of "learn" is "had learned."