In which one of the following sentences is but used as a preposition? A. The lake is pretty, but it's too cold for swimming. B. I would like to return to Italy, but I have no money. C. We discovered that Candy will do anything but work. D. I wanted to leave, but I was embarrassed to do so.
The answer is C. This is because but is being used as a conjunction separating independent clauses in the other answers. You can remove but from A, B, and D, and you are left with 2 simple sentences. I hope this helps!!!