摘要： –May I go to the cinema, Mum? --Certainly. But you be back by 11 o’clock. A. can B. may C. must D. need

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--May I go to the cinema, Mum?
--Certainly. But you ________ be back by 11 o'clock.

--May I go to the cinema, Mum?--Certainly. But you ________ be back by 11 o'clock.