Is this sentence correct:
"Jef Bush HAS EXERCISED some public service posts in Florida."
Or even just as;
"Jef Bush HAS EXERCISED some public posts in Florida."
Do you mean Jeb Bush? The idea of "exercising" a post does not seem right to me. You can say "held" if that's what you mean.
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Do you mean Jeb Bush? The idea of "exercising" a post does not seem right to me. You can say "held" if that's what you mean. I don't see that the word "service" adds much value. You can say:
Jeb Bush has held some public posts in Florida.
If "some" feels weak, you can say e.g. "several" or "various" or "a number of".