In British English you could use either if you were actually inside the building. If you were standing outside you would have to use 'at'.
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AnonymousIn this sentence " I work in ABC Company", when ABC is a proper noun, are both "in" and "at" correct? What is the difference? Thank you very much.
Katarina Which preposition is correct:
a. I am at the library.
b. I am in the library.
Thanks.
Kat
Both are correct. See
CJ