—We'll go to the party to be held in Qinghai Grand Theater at 8 tonight. Could you join us?

—I'm afraid I can't. I ________ the holiday plan with my friends.

A．am discussing

B．have discussed

C．will be discussing

D．will have discussed

不是肺脓肿手术指征的是( )。

A．急性肺脓肿

B．反复大咯血

C．支气管胸膜瘘

D．合并支气管扩张者

E．内科积极治疗无效的慢性肺脓肿