问题
选择题
-May we leave the classroom now?
-No, you _______. You _______ to leave until the bell rings.
A．can't; are allowed
B．mustn't; aren't allowed
C．needn't; are allowed
D．needn't; aren't allowed
答案
答案：B
题目分析：句意：我们现在可以离开教室了吗？不，不能。直到响铃你们才可以离开。May引导的一般疑问句，肯定回答用may；否定回答用can’t或者mustn’t。not…until“直到……才”。故选B。