I were wondering if in the sentence
Sorry, I [was\were] hacked
i should use was or were. I know, that according to the book, you should use "was", due to it being singular. Yet on the other hand i've stumbled upon an article on bbc.com, where it was stated that "were" might be used, in formal cases. For instance if you are to inform your superiors, or whatsoever.
Could someone clarify that?