The first "a" does the job for all three nouns. My mother is a teacher, (a) nurse, and (a) best friend, all rolled into one.
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Mr. TomDo you find this sentence OK? I mean, there is no article before best?It’s a little odd. I’d expect
My mother is a teacher, nurse, and best friend, all rolled into one.
Mr. Tom...but do we say "a best friend" at all?Yes, when we see 'best friend' as a function rather than refer to a particular person's best friend.