问题
May we leave the classroomnow —- No, you _____.You _____ to leave until the bell rings.
A: mustn’t,are allowed
B: can’t, aren’tsupposed
C:don’thave to, are supposed
D: needn’t,aren’t allowed
B: can’t, aren’tsupposed
C:don’thave to, are supposed
D: needn’t,aren’t allowed
正确答案是：
