He was laying a foundation for a work that would be completed in our 20th century.
The Watchtower Announcing Jehovah’s Kingdom. January 1, 1989 p. 12
As it originally appeared in print (highlighted for emphasis):
He was laying a foundation for a work that would be completed in our day.
(Bound volume and CD)
The Watchtower Announcing Jehovah’s Kingdom. January 1, 1989 p. 12