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* exercise: rewrite these sentences:
1. the last time she went to the zoo was ten years ago.
→ she hasn't
2. i have never met such a famous person before.
→ it is
3. i last saw him when i was a student.
→ i haven't
4. i haven't come there for two years.
→ i last .
5. i have studied english for seven years.
→ i started ..
6. steve started working for this company five years ago.
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