If this were a "fill in the gaps" exercise, and the phrasal verb had been removed, what word would you guess went in the space?
I felt a bit naughty ____________ on my own, leaving the children behind.[/QUOTE
Wrong? - Is this correct choice
No. You are not looking for an adjective. "Naughty" sort of means "wrong" in a way. Does it help if I change it to this?
I felt a bit naughty because I was __________ on my own and I was leaving the children behind.
Have you looked up the definition of "to go off", the phrasal verb which was used in the original sentence?