过去进行时的用法小练（上）
I.用括号中所给动词的正确形式填空。
1. We ____________ in the classroom at nine this morning. (study)
2. I ______________ clothes when someone knocked at the door. (wash)
3. When Harry ___________ breakfast, Lily called her for help. (have)
4. What __________ you _________ at this time yesterday afternoon? (do)
5. Li Ming ____________ a letter to his friend at eight o’clock yesterday evening. (write)
6. It was four. The students ____________ games on the playground. (play)
7. When I ___________ to school this morning, I saw a car running into a bus. (go)
8. They ___________ in the room from eight to ten yesterday morning. (sing)
