认真朗读以下对话,选出正确的答案。 A:Hello, one ticket to Bath, please. B: _____1_______ A: Single, please. B: A single ticket to Bath. That's 56 pounds. A: _____2_____ B: Here's your ticket and change, sir. A: What time does the next train leave? B: _______3_____ A: And which platform is it? B: Platform 3. A: Thanks. Goodbye. B: ____4______ A. Goodbye B. At 8:00 am. C. Here you are. D. Single or return, sir?