发言者
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0:00章章章 章章 章 次 第一章 章 第一章 一章 1: Number 20. 17s · Speaker 1
Number 20. When does the keynote speaker's presentation start? A. In the main auditorium. B. It's listed in the event program. C. He's a renowned speaker.
Number 20. When does the keynote speaker's presentation start? A. In the main auditorium. B. It's listed in the event program. C. He's a renowned speaker.