By the time my mum got home, I _______ my homework.
A:have finished
B:had finished
C:finished
D:will finish
水与人类生活和生产的关系十分密切,请回答下列问题:
东汉末年群雄并起,最终形成三国鼎立的格局。下列示意图符合公元222年三国局势的是( )
— What did you do last vacation?
— I ______ at home.