Situation: Two persons are talking in the hotel .
Speaker A: I’d like to have a single room with bath today.
Speaker B: __________
选择一项：
a. Of course, you can.
b. Go ahead.
c. I’m sorry, but all the rooms are booked. 解析：第一个说话人说，“我今天想要个带浴室的单人间”； 礼貌回答应该是：“很抱歉，所有的单人房间已订满了”。
d. The single room is expensive.