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Ответ:

Ex. 2

Объяснение:

1. The detective had been watching the building for an hour when he saw a man come out.

2. Max spoke German well because he had been studying it since 2001.

3. The rescue team had been working till 5 am before they found the survivors.

4. We had been living here until 2007 when we decided to move back to our village.

5. The telephone had been ringing for five minutes before I answered it.

6. Miriam had been feeling unwell for two weeks before she went to the doctor.

7. Lucy had been playing the piano when she was a child.