The key to exercise solutions in chapter Unit 16 - Past perfect continuous for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press
Question
Which is right?
Answer
were having
We'd been travelling
He was looking
She'd been running
He was walking
I'd had it
I'd been going
I've been training
she was waiting; she'd been waiting
a) he was already working; b) had already been working; c) He's been working