The mayor was elected on a promise to cleanse the city government of corruption.
I don't understand the first half of the sentence "The mayor was elected on a promise". Could you tell me what it means?
The mayor promised (before he was elected) to cleanse the city government of corruption ( and this helped him win the election).
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The mayor promised (before he was elected) to cleanse the city government of corruption ( and this helped him win the election).