16.答:B最佳[分析]该题考查的语境是打电话预定房间。What can I do for
you?是服务员招呼顾客,询问对方需要帮什么忙的客套语; What's the matter
? 怎么啦? at sb.'s service听某人吩咐,听凭某人使用,均与客人电话中说的 I'd like to book a room for the nights of
the 18th and 19th. 语意不吻合。只有填入无动词祈使句 Just a minute, please. (请等一下。)才与会话的语境相符,故答案为B。