past perfect continuous

Sally ___________ (type) this text for 3 hours before Mark came.

• typed

• was typing

• had been typing

Steven felt tired as he __________ (sail) for several hours.

• has sailed

• had been sailing

• was sailed

How long ____________ you_________ (watch) TV before you decided to go to bed?

• has you been watching

• had you been watching

• had watching

Laura needed a break because she (solve)______________________ past perfect continuous tense exercises all morning.

• had been solving

• solving

• was solved

She ___________(not/sit) at home for long before she went out.

• has not been sat

• had not been sitting

• didn't sit

How long ______________________________(you/ learn) English before you took TOEFL?

• had you been learning

• learnt

• has learnt

She ________________ (not / work) but she was tired anyway.

• was not working

• had not worked

• had not been working

I _________(not / sleep) long when there was a knock on the door.

• had not been sleeping

• had not slept

• had been slept

How long had you been living in the USA before you decided to move back into your homeland?

(a)  

my father and older brothers had been working in different fields until we decided to leave the USA.

(a)