单项选择题
W:Excuse me.Can you help me
M:Yes
W:I have a ticket to Seattle.Where can I check in
M:Sorry, I can’t help you here.You have to go to the ticket counter You’ll see a sign there that says, "Check-in", then look for the airline you want.
A. To buy a ticket
B. To check in
C. To receive a guest
D. To return a ticket