介绍:
Unit8
1. I was having a shower at that time.
2. I was reviewing my lessons last night.
3. What were you doing when I called you?
4. I was drawing a picture this time yersterday.
5. I was writing a letter to my friend last night.
6. I was studying at the library at the time of the fire.
7. I was watering the flowers when he knocked at the door.
8. We were cleaning the classroom from 4 to 6 yesterday afternoon.
