Question

Nちゃん

赤い文字で書いてあるのが回答なのですが、解説がないためなぜこうなるのかわかりません。どなたか解説をお願いします🙏🙏

That the scientific progress has been wonderful cannot be denied, but (1)that it of itself gives us the right to
look upon ourselves as the most highly civilized people (2)that the world has ever seen is (3)open, at least, to
question.
問1. 下線部(1), (2) と近い働きの that を含む英文をそれぞれ選びなさい。5*2
1That man is my uncle brought here by his son.
(1) @)
(2) 4
That he is innocent is certain.
3The problem was so difficult that none of us could solve it.
4They are the very boys that I've been telling you about.