血清淀粉酶增高的情况除外（）

A.消化性溃疡穿孔

B.急性消化道出血

C.胆囊炎

D.胆石症

E.肠梗阻

—There's someone knocking on the door．Who        it be?

—It must be Mary．She promised to be here at 8：00．

A．must

B．can

C．shall

D．need