| A. Use past simple for something that was finished in the past.
- She traveled in Europe. (at some time in the past)
B. Use past progressive (was/were -ing) for a temporary routine or situation that happened in the past.
- She was traveling in Europe. (last summer; for one month)
C. Use past perfect (had -ed) for something that happened before a certain point in time in the past.
- She had traveled in Europe before she decided to study there.
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