So, I came across a very strange sentence a while ago in a text book.
It sounded like this:
 
"Have you have been paying attention? "
 
It sounds absurd - according to the grammar I have been taught and teach, it should be:
 
 
"Have you  been paying attention?"
 
So, I am quite prone to thinking that it was a misprint...
 
Does any of you, dear community members (esp. the native-speakers), have any other suggestions?
 
 If the first sentence is NOT a misprint, what can be the name of the tense? :D 
 
The textbook where I came across this curious thing  is Oxford Solutions.