单项选择题
Salesman: Good morning, sir. May I help you Customer: That"s OK. Salesman: Fine. Please take your time.
单项选择题 Jill: Hi, Jane, this is Jill. Do you have time to talk Jane: Hi, Jill, ______. I was just watching TV.
单项选择题 【B3】
单项选择题 Which of the following choices can help you fly to Beijing at the lowest cost
