南方商品经济得到发展，同时也促进城市的繁荣。下列城市人口达到百万的是      [ ]

A．建业        

B．长安          

C．洛阳            

D．建康

—Did Jim come?

—I don’t know. He _______ while I was out.

A．might have come

B．might come

C．mush have come

D．should have come