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Dr Geoffrey Home
Prepositions are difficult for non native speakers, but to arrive "at the nick of time" would require "nick" to be a specific place and it isn't.
shashi Purandare
It is nice to do such exercise, it will definitely improve English Language skills thanks

Trolley6969
"At" the nick of time? Are you kidding? I suppose it makes sense if "The Nick of Time" is a place: They arrived at The Nick of Time - a jail for chrononauts! Obviously the answer is "In" - I just can't believe that over 50% of people think it's "at".