–MayIgotothecinema,Mum? --Certainly.Butyou

問題詳情：

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

       A. can             B. may             C. must            D. need

【回答】

C

知識點：情態動詞

題型：選擇題