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스마트폰 사용 시간, 얼마가 적당할까?

Read a short article about one office worker's smartphone use and what makes screen time "too much."

この教材について

Understand the main points of the article, and tell when -(으)ㄹ걸요 is a guess and -(으)ㄹ걸 그랬어요 is a regret.

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