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다음 대화 중 자연스럽지 않은 것은?
① A: Can you answer the phone?
B: Sure.
② A: Should I bring an umbrella today?
B: Yes, you should. It’s going to rain.
③ A: Must I fill out this form?
B: No, you don’t have to.
④ A: Are you able to visit me tomorrow?
B: I’m afraid I can’t.
⑤ A: May I have your attention, please?
B: No, I can’t.