题目内容

----May we leave the classroom now?
----No, you         . You           to leave until the bell rings.
A．mustn’t; are allowedB．can’t; aren’t allowed
C．don’t have to; are allowedD．needn’t; aren’t allowed
B

试题分析：固定句型结构may I+动词原形表示我能不能做某事，表示的是一种请求，肯定性回答常用can，否定性回答常用mustn’t或can't来回答。故选B。
点评：情态动词的用法很多，对于常规性的知识点考查的比较多，但对于特殊性的英语的表达方式也要死记。
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