单项选择题
A．All students had traveled in commercial planes before. B．All students were nervous. C．Most students felt nervous traveling in commercial planes. D．Most students felt nervous when they were taken up in a fighter plan
A．to take an experienced pilot in a plane B．to be taken up into the air in a plane by an officer C．to fly a commercial plane D．to talk about his ideas
A．the students to fly the plane all the time B．all students to fly the plane C．the students who were not frightened to fly on their own D．some students to fly a little while