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)”。
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