单选题 Helen:【D5】______Do you study Chinese at the university here? Rose: Yes, I do. But my characters are very bad. Helen: 【D6】______Rose: Are you Chinese? Helen: Yes, I am. I came here to study political science. Rose: 【D7】______ Helen: I like it so far. But my English still needs work. A. It takes a long time to learn Chinese writing. B. How are you doing? C. How do you like it? D. Excuse me.