A

1 – had left
2 – already saw
3 – hadn’t finished
4 – had you just spoken
5 – we set off
6 – I already ate
7 – had you heard

B

1 B
2 A
3 A
4 B
5 A
6 A
7 B

C

1 – We had just heard the news when you rang.

2 – I had already thought of that before you suggested it.

3 – When I turned on the TV the program had already started.

4 – She was hungry because she had not eaten anything all day.

5 – By the time I left school I had decided to become a musician.