Sentence examples for had once is from inspiring English sources

I.3 "I'm sure my choices have been affected because it's affected my personality and my confidence and so the job I might have had once is no longer...... (pause) you know.

Antarctica had once been warm.

(Green had once been chairman).

These conditions had once been uniformly fatal.

Macdonald had once been such a cat.

The building had once been a hotel.

This ice had once been rainwater.

Sir Garfield had once been his teacher.

It had once been a mill town.

He had once been their neighbor.

Hearings had once been optional.