They spent several hours making the old man convinced of the safety of travelling by air. (升级为it作形式主语的句子) the old man c

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1. They spent several hours making the old man convinced of the safety of travelling by air. (升级为it作形式主语的句子)
the old man convinced of the safety of travelling by air.

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高中英语人教版（2019）选修三Unit 4 Adversity and Courage单元基础全覆盖检测