选择合适的选项补全对话。 A. I am playing B. Hi C. play D. what are you doing Li Ming: Hi, Gao Wei. Gao Wei: 1___________, Li Ming. Li Ming: What are you doing? Gao Wei: 2___________. And 3___________? Li Ming: I am eating. Gao Wei: Let's (让我们) 4___________ together. Li Ming: Okay!