{"answers": "D", "options": ["f : good idea . we can sit together in the marketing class from now on . that is so good .", "f : ok. we can share the cost of the textbook of marketing and use it together .", "f : although i do n't have his course , i suggest you thinking about prof. qian 's course more seriously .", "f : let 's share the cost of the textbook and use it together . we can save a lot of money ."], "article": "f : excuse me , are you going to buy that textbook ? m : well , yeah , i need it for a class . but it 's awfully expensive . f : oh , we must be in the same class ! civil engineering ? m : yes , that 's the one ! f : were you there last friday for the first class ? m : yes . i only moved here last monday , and i registered for the class last tuesday . by the way , i thought professor qian really seemed to know his subject . f : yes , his courses are always fantastic , except that he is very strict with his students . hey , i 've got an idea ! why do n't we share the cost and use the textbook together ? m : sounds great . then let 's sit together next class .", "id": "train_1545"}