多半可以除外急性胰腺炎的指标是（）

A.尿胰蛋白酶原-2阴性

B.对氨基苯甲酸试验

C.胰糜蛋白酶降低

D.血清淀粉酶升高而血清脂肪酶不升高

E.血清脂肪酶升高

---Hi, Tom. Any idea where Jane is? 

---She         in the classroom. I saw her there just now. 

A．shall be

B．should have been

C．must be

D．might have been