I would use 'at', reserving 'in' for Genesis .
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Vincent TeoCan I say,A reasonably good rule of thumb: if of occurs after beginning or end, use at:
(i) At / IN the beginning of the race, the hare ran very fast.
9ii) The hare ran very fast At / IN the beginning (of the race)
New2grammarI'm a big fan of your rules, CB including this one!!! You make my life easier.My pleasure!