All the passengers were of the flight which was put off because of heavy fog.A. informed

问题补充：

All the passengers were of the flight which was put off because of heavy fog.

A. informed

B. declared

C. accused

D. remarked

答案：

(答案→)A. informed

B. declared

C. accused

D. remarked

解析：inform sb.of sth.“通知某人某事，提醒某人某事”，此处用其被动语态。