Условие задания:
3 Б.
Read the sentences and write only the verb forms into these sentences. Use the past perfect or the past perfect continuous.

1. We_____(watch) TV for some time before my sister went to bed.
2. The managers______(search) for new clients for 2 hours before Mark came into the meeting room.
3. Carol got a bad mark because he _____(make) many mistakes in her test.
Источники:
grammar-tei.com
www.clker.com