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 programme had already started.
4.She was hungry because she hadn't eaten anything all day.
5.By the time I left school I had decided to become a musician.