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从方框中选择适当的句子完成下面的对话,其中有一多余选项。 A. Really? It's very kind of you. B. What happened? C. You know, English is very useful. D. It's hard, but it's important. E. I'm sorry to hear that. F. Can you give me some advice? Li Xiang: Li Ming, you look so worried. Li Ming: Yeah. Li Xiang: 1______ Li Ming: Well, I got a 'C' in the English exam. Li Xiang: 2______ Li Ming: I think English is too difficult for me. I don't understand why we Chinese students have to learn it. Li Xiang: 3______ Li Ming: You are right, but English is hard. Li Xiang: 4______ Let me help you. Li Ming: 5______