We didn't know the answer to the question that why he didn't attend the metting yesterday

问题描述:

We didn't know the answer to the question that why he didn't attend the metting yesterday
单句改错 我原先将didn't改成了don't 错的……求答案与解释

把that去掉
前面已经说了我们不知道问题的答案,后面的从句就是要引出这个问题,that后面不可能跟不确定的句子,所以是why引导这个句子但是 同位语名从里的that不是不能省略的吗?question和后面的从句不是同位语从句吗?