The judges announced that Jack became the champion.
The judges announced that Jack was the champion.
The judges announced (that) Jack became the champion when the results were out.
Top answer
Vincent Teo Can I say, The judges announced that Jack became the champion. The judges announced that Jack was the champion. The judges announced (that) Jack became the champion when the results were out.
— Philip
Vincent Teo Can I say, The judges announced that Jack became the champion.
The judges announced that Jack was the champion.
The judges announced (that) Jack became the champion when the results were out.
Here, and in previous posts, I think that "was" is better than "became".
You could also say, "the judges declared Jack (the) champion".
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