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Lesson 9. Who Wore the First Eyeglasses?

Ingyu: Do you know who first thought of an airplane?

                      -> 간접 의문문 (의문사 주어인 의문문)

Jenny: No, I don't. Do you?

Ingyu: Of course. It was Leonardo da Vinci.

Jenny: Really? 

Ingyu: Yes. I read it in a book.

                    책에서