男性，53岁。因慢性咳喘30余年。晨起排便屏气时突起呼吸困难加重伴右侧胸痛，前来急诊。诊断右侧张力性气胸。下列处理意见中哪项是不妥当的（）。

A.胸腔插管持续负压引流排气

B.胸腔插管正压排气

C.氧疗

D.血气监测

E.保持大便通畅

We         arrive at six. But I’m sorry we are late.

A．should

B．were supposed to

C．must

D．ought to