彼は先生___なりました。 (He became a teacher.)
Answer and explanation
Correct answer: A. に
に marks the result of a change with なる.
Answer: に.
Why not the others: を: を marks an object. で: で marks a place or means. と: と means with.
Answer: に.
Why not the others: を: を marks an object. で: で marks a place or means. と: と means with.
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