"“If you had looked at it {the newspaper}, sir, you would have seen at a glance what the errand is on which I have come to you...."
https://etc.usf.edu/lit2go/178/the-return-of-sherlock-holmes/3227/chapter-ii-the-adventure-of-the-norwood-builder/

Однако, не думаю, что вашему учителю понравится оригинал К.Дойла

Анастасия, это явно ловушка)