Past Perfect or Past Perfect Continuous: Completed or Ongoing?

Choose the correct form, then answer the questions about it

1. They
   the same scene for three hours.
   1. had been filming
   2. had filmed
2. They had been filming the same scene for three hours.
   Was the action completed or ongoing?
   1. Completed
   2. Ongoing
3. They had been filming the same scene for three hours.
   What is the focus of this action?
   1. Duration
   2. Result
4. She knew his name because she
   him before.
   1. had met
   2. had been meeting
5. She knew his name because she had met him before.
   Was the action completed or ongoing?
   1. Completed
   2. Ongoing
6. She knew his name because she had met him before.
   What is the focus of this action?
   1. Duration
   2. Result
7. It
   since early that morning, and the garden chairs were wet.
   1. had rained
   2. had been raining
8. It had been raining since early that morning, and the garden chairs were wet.
   Was the action completed or ongoing?
   1. Completed
   2. Ongoing
9. It had been raining since early that morning, and the garden chairs were wet.
   What is the focus of this action?
   1. Result
   2. Duration
10. The phone
    six times before they answered it.
    1. had been ringing
    2. had rung
11. The phone had rung six times before they answered it.
    Was the action completed or ongoing?
    1. Completed
    2. Ongoing
12. The phone had rung six times before they answered it.
    What is the focus of this action?
    1. Duration
    2. Result
13. By the time the doors opened, they
    in the rain for thirty minutes.
    1. had waited
    2. had been waiting
14. By the time the doors opened, they had been waiting in the rain for thirty minutes.
    Was the action completed or ongoing?
    1. Completed
    2. Ongoing
15. By the time the doors opened, they had been waiting in the rain for thirty minutes.
    What is the focus of this action?
    1. Duration
    2. Result