You ask ask questions of. You can pose questions to, or submit questions to. Some verbs take certain prepositions all the time, or in almost ever case - others take different prepositions depending on the particular usage.
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Grammar GeekYou ask ask questions of.Not always, GG. If the mistake is to use "about" instead of "of" above, for example:
You can pose questions to, or submit questions to.
. I'm afraid the only thing to do is memorize them - but a native speaker will understand your meaning if you make a mistake.