As it was almost time for the flight all the passengers got the plane.A. aroundB. abroad

问题补充：

As it was almost time for the flight, all the passengers got the plane.

A. around

B. abroad

C. aboard

D. ahead

答案：

A. around

B. abroad

(答案→)C. aboard

D. ahead

解析：aboard 用作介词时意思“在(船、飞机、车)上”、“上(船、飞机、车)”。