单选题 Waiter: Would you like to have one bill or separate bills, sir?
John: It"s my treat. One bill, please.
Paul: You paid last time. ______
John: Well, all right if you insist. But next time you must let me pay.
【正确答案】 A
【答案解析】[解析] 服务员问他们是要一起付，还是分开付款，John说一起付，他请客。Paul说上次是你付的，这次应该让我付，所以A选项符合题意。