Only when       possible to settle the problem.

A．our teacher comes will it be

B．does our teacher comes will it be

C．our teacher comes it will be

D．has our teacher come will it be

男性，30岁，1周前受凉后出现发热、恶寒、咳嗽、吐黏液脓痰，不规则服用"螺旋霉素"疗效欠佳，近日胸痛、咳吐脓血臭痰，伴高热、全身无力，可能的诊断为（）。

A.大叶性肺炎

B.支原体肺炎

C.肺脓肿

D.肺结核

E.肺癌