单项选择题
M: Good morning. Will you book a plane ticket to London for me
W: Yes, sir. What time would you like to leave
M: Next Tuesday, if possible.
W: That’ll be the 21st of December.
M: Yes, that’s right.
W: There are several flights available.
M: Would you check what flights are available on the 21st of December
W: All right. Let me check it over.
M: Morning flights will be perfect.
W: Yes, sir. There is a flight available on that day, at 10:00 a.m.
M: Fine. I’ll take that flight, then.
W: 10:00 a.m. I’ll fix your ticket.
M: When do I check in
W: You must be there by 9:00 a.m.
M: Thank you.
A. Wife and husband.
B. Teacher and student.
C. Clerk and guest.
D. Employer and employee.