When to use annouce in stead of said?

[Mirko]

Business Idiom in English, Intermediate level

ESL/EFL Test #135 "Ways of threatening", question 1

If I've ......... you once, I've done it a hundred times. Don't do it!

(a) spoken
(b) said
(c) told
(d) mentioned

Business Idiom in English, Intermediate level

ESL/EFL Test #135 "Ways of threatening", answer 1

If I've told you once, I've done it a hundred times. Don't do it!

Correct answer: (c) told
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when to use annouce in stead of said?

Mirko

[Mister Micawber]

'Announce' is used for telling the public at large.
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Native English teacher at Mister Micawber's