Read these sentences and fill in the gaps with the correct verb form in the past perfect continuous.

Example 0. John his dog all day. He was tired yesterday. (walk)

Answer 0. had been walking.

1. We to open the door for five minutes when Jane found her key. (try)

2. She here for over 2 years before you started working here. (work)

3. We in that college for five years. It was difficult. (study)

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