Guest: Good morning.（）Here’s my key card.Clerk: Was your stay satisfactory?Guest: Yes.Very nice, thanks.

Guest: Good morning.（）Here’s my key card.Clerk: Was your stay satisfactory?Guest: Yes.Very nice, thanks.
A.How do you want to pay?
B.I have a reservation for tonight.
C.Thank you for staying with me.
D.I’m checking out.
正确答案：I’m checking out.