问题
选择题
- Excuse me, may I keep the book a little longer? - Sorry. You ________ return it today.
A．must
B．mustn't
C．can
D．can't
答案
答案：A
题目分析：句意：—对不起，请问这本书我可以多看一段时间吗？—很抱歉。今天你必须还。A. must必须；B. mustn't禁止；C. can能、会；D. can't不能。句意和词意结合可知，选A。