高中英语。求大神帮忙找出我翻译出来的英文句子中的错误，并帮我改正过来。谢谢谢谢！高悬赏！！！！！！

Question

如题所述

Answer 1

What made him unable to attend the meeting is still a puzzle.
The party's atmosphere yesterday was very joyful and everyone had a good time.
4. that去掉