英语 不懂 (21 10:9:33)

英语 不懂 (21 10:9:33)
See who is there!______ it be May?
A．May    
B．Must    
C．Can    
D．Will
－You look so tired,Teddy.
－Yes,I am tired out.I _________ for a whole day.
A．have worked  
B．have been working 
C．worked   
D．had worked