in formal occasion还是on formal occasion?

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in formal occasion还是on formal occasion?

in formal occasion还是on formal occasion?
in formal occasion还是on formal occasion?

in formal occasion还是on formal occasion?
与occasion搭配的相关词组:
by occasion of由于,因为;
on occasion(s)偶尔,间或,有时;
on the occasion of在…之际;
所以要用on

on formal occasions 或者 on a formal occasion

on great occasions
在大庆[盛典]时期
用On