that后面加什么介詞

　　She of all people should know the answer to that.

　　在所有的人中，唯有她最應知道那個問題的答案。

　　I'd like to come on to that question later.

　　我想以后再討論那個問題。

　　That is no way to treat another human being.

　　那絕不是對待他人的方式。

　　Had I known that I would never have come.

　　要是早知道，我絕不會來的。

　　The need to communicate is a key characteristic of human society.

　　需要交流是人類社會最重要的一個特征。