Webb met a changeable weather, which he had not experienced in US in the flight. And it ______.

A．Webb is a pilot who has been tired of planes' being late.
B．Webb is a pilot who has never had the experience of planes' being late.
C．Webb is a pilot who is trying his best to keep his flights on time.
D．Webb is a pilot who finds it hard to understand China's air traffic control.

A．is not satisfied with Western flight attendants
B．thinks highly of the flight attendants in China
C．encourages Chinese flight attendants to improve services
D．admires the services of Western flight attendants