A：夏季地下水补给丰富
B：流域内夏季降水丰富
C：夏季气温高
D：夏季湖泊水补给丰富
头发乌黑通直、脸庞扁平的是 ( )
- Has David finished his project yet?
- I guess not. He ___________ on it at lunch time. Do you want me to confirm it?
