题目内容

- Excuse me, may I keep the book a little longer?  - Sorry. You ________ return it today.
A．mustB．mustn'tC．canD．can't
A

试题分析：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。
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