Tenses revision 1 (Advanced)

When I arrived, Bob .... TV.
1. was watching
2. has been watching
3. had been watched
The bus wasn't there. It .....
1. had already left
2. had been already left
3. has already left
Jim is exhausted. He ....
1. has been running
2. had been running
3. has running
How long .... when they found it?
1. had they searched
2. have they searched
3. would they searched
I didn't have much to eat at lunch because .... a lot at breakfast.
1. I'd eaten
2. I'd have eaten
3. I was eating
I .... long when she arrived in a hurry.
1. haven't been waiting
2. hadn't been waiting
3. won't have been waiting
She .... to speak English before she arrived in London.
1. had already learned
2. had learned already
3. will have already learned
Tom spoke good Spanish because he .... for several years.
1. had been studying
2. had studied
3. has studied
Cervantes would be famous even if he .... "Don Quixote"
1. had not written
2. has not written
3. has not written
I .... from him for ten years when I received his e-mail.
1. hadn't heard
2. didn't hear
3. hadn't been hearing

TENSES REVISION (1)
Revisión de tiempos (1)