单选(1068):-Good morning ,Room Reservations.May I help you ,si

单选(1068):-Good morning ,Room Reservations.May I help you ,sir?-Good morning ,Room Reservations.May I help you ,sir?-Yes,I'd like to book a room.-____.Which date would that be?A.Thank you ,sirB.That's all right,sirC.You're welcome.sirD.No trouble,sir