It took us several hours to make the old man of the safety of travelling by air.
A. believed
B. convinced
C. informed
D. persuaded
网友回答
A. believed
(答案→)B. convinced
C. informed
D. persuaded
解析：A. believed相信，B. convinced使…相信，C. informed通知，D. persuaded说服，句意：花了我们几个小时使这个老人相信乘飞机的安全。Convince sb of sth“使某人相信…”,sb be convinced of…，所以用过去分词做宾语补足语，所以选B。