Present Perfect Simple vs Present Perfect Contin ...

Nathan has sung / has been singing the same song all morning. It's driving crazy.

Amanda has known / has been knowing Natalia for about three years now.

How long have you saved / have you been saving money for a new phone?

Jessica has eaten / has been eating the same kind of frozen meal five times this week.

Karen hasn't been playing / hasn't played football since she broke her leg last year.

Actually, I can speak German, so I have understood / have been understanding everything you said about me.

Rebecca has been reading / has read that novel all day.

James and Petter have looked / have been looking at photos all morning.

Tom and Anna have met / have been meeting in secret since their parents told them to stop seeing each other.