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.

患者，男，33岁。胸部创伤伴失血性休克，伤后发生急性肾衰竭，以下哪项不属急性肾衰竭的发病机制

A．肾小管细胞变性坏死

B．肾小球内皮细胞变性坏死

C．休克

D．肾缺血

E．肾脏缺血—再灌注损伤