大部分（）草坪草根的生长均以土壤不结冻为限，即使在深秋也继续生长。
A.暖季型
B.植生带
C.喷播
D.冷季型
参考答案：D
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.
