一天早晨的气温是-7℃，中午的气温比早晨上升了11℃，中午的气温是    [ ]

A．11℃   

B．4℃    

C．18℃    

D．-11℃

He ______ his homework at seven yesterday evening.[ ]

A. did        

B. does    

C. was doing  

D. had done