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Hello, tdol.
I am really confused. I happened to send my question twice by mistake. You've given 2 contradictory answers.
In your first one, who did you agree with? You can't have agreed with me, because my question was alternative. Which means you agreed with Matilda, who says Maude works at school (no article).
In this one you say Maude works at a school is correct.
????? Will you be so kind to explain?
At school – at a school 
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