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다음 중 두 문장의 의미가 같은 것은?
① It rains, so I stay home.→ If it rains, I would not stay home.
② I don't have wings, so I can't fly.→ If I had wings, I couldn't fly.
③ If she were kind, many people would like her.→ She is kind, but many people don't like her.
④ I don't know him, so I can't introduce him to you.→ If I knew him, I could introduce him to you.
⑤ I don't have wings, so I can't fly to school.→ If I had had wings, I could fly to school.