问题
填空题
用since或 for填空。
1. I've been practicing the piano 10:30.
2. Maria has been running 15 minutes.
3. Sarah has been sleeping 9:00.
4. Dale has been talking on the phone five minutes.
5. Louie has been studying he was six years old.
6. I've been watching you ten minutes.
7. The Lin family has been living in the neighborhood August.
答案
1. since 2. for 3. since 4. for 5. since 6. for 7. since
