—You were brave enough to raise objection at the meeting.

—Well, now I regret ________ that.

A．to do

B．to be doing

C．to have done

D．having done

内科治疗急性胰腺炎的基本原则是（）

A.密切监测病情

B.抑制胰液分泌

C.纠正休克与水、电解质平衡失调

D.对症处理

E.防止继发感染及其他并发症