Mary was caught in a traffic jam and by the time she arrived at the airport her father’s plane_______.

A．took off

B．had already taken off

C．was take off

D．had already been taken off

肺胀与气胸鉴别主要依靠

A．气急上逆

B．胸部X线

C．面晦唇暗

D．咳喘病史

E．以上均不是