问题
Can we leave the classroom now—No, you _________. You _________ to leave until the bell rings.
A:don’t have to; are supposed
B:mustn’t; are allowed
C:needn’t; aren’t allowed
D:can’t; aren’t supposed;
B:mustn’t; are allowed
C:needn’t; aren’t allowed
D:can’t; aren’t supposed;
正确答案是：
