胃癌常见症状（）。

A.幽门梗阻

B.皮肌炎

C.恶性贫血伴胃体显著萎缩

D.贫血

E.慢性浅表性胃炎

—Must I hand in my homework today?

—No, you _____. Tomorrow is OK.       [ ]

A. mustn't                    

B. wouldn't                   

C. can't                     

D. needn't