—I was asked to attend the meeting before eight.

—Oh, you________. I'm sorry for not telling you that we have changed the plan.

A．must

B．can't

C．may

D．needn't

下面哪条与腹部手术麻醉选择无关（）

A.一般情况

B.重要器官损害程度

C.手术部位和时间长短

D.麻醉设备条件

E.麻醉医师的偏执爱好