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Complete the following sentences with past perfect continuous:
(Completa las siguientes oraciones con pasado perfecto continuo)
1. Lisa (work) at her uncle's firm for more than six years.
2. We (read) John's stories for 10 years.
3. They (study) all the month for that project.
4. I (walk) for such a long time. So, I felt really tired when I got home.
5. (smoke) here before Sarah arrived? - The smell was terrible.
6. During several weeks, George (think) how to build a drone.
7. That woman (wait) the bus along 40 minutes.
8. John (travel) all around the world when he and his wife had the accident.