问题
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;
B:mustn't; aren't allowed
C:needn't; are allowed
D:needn't; aren't allowed;
正确答案是：
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