会计报表附注(名词解释)

A. having
B. had
C. having been
D. have

A. in the development of air transportation
B. the earliest passenger flights were successfully operated
C. to make travel easy and pleasant for the passengers
D. to provide different services
E. the shortage of qualified pilots
F. traveling by air was very cheap

A. as many as
B. as well as
C. as soon as
D. as much as