《Unit 5 Nelson Mandela---a modern hero》(grammar)课件 人教版必修一
《Unit 5 Nelson Mandela---a modern hero》(grammar)课件 人教版必修一第5页

Because he knew it was to realize his dream of making black and white people equal.

The reason why Elias was happy to help Nelson Mandela was that he knew it was to realize his dream of making black and white people equal.

The reason why… was that