从方框中选择合适的选项补全对话。 A. Don't cross the street. B. The light is green now. Let's go. C. Let's go to the shop. D. Be careful! A: Sister, I want an ice-cream. 1． B: OK! 2． A car is coming! A: I'm sorry. B: Look at the red light. 3． A: Oh, I see. B: 4． A: OK.
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