I have a lot of trouble with prepositions. I have made up the similar sentences below.
(1) In my last job, I was a chemist.
(2) On my last job, I was a chemist.
(3) For my last job, I was a chemist.
All of my friends are non-native English speakers. They all think all of the prepositions work. I am not sure if my friends are correct. Please help me. Thank you.
correct preposition: for/in/on my last job
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