介绍:
Unit18
1. It has rained a lot these days.
2. The temperature has stayed hot this week.
3. I haven't eaten anything since breakfast.
4. I have known her since we were children.
5. I have studied English for six years.
6. She has been a dancer for ten years.
7. She has taught in this school for twenty years.
8. It's nice to see you. We haven't seen each other for a long time.
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