Question

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青のtoってどういう用法ですか？

- 例題 14
However, I feel that the teacher's role is more fundamen-
tal than the critic's. It comes down ultimately, I think, to
the fact that his first obligation is to the truth of the subject
he is teaching, and that for the reading of literature ever to
become a habit and a pleasure, it must first be a discipline.

to