问题：
-May we leave the classroom now?
-No, you ______. You ______ to leave until the bell rings.
A．mustn’t, are allowed
B．don’t have to, are supposed
C．needn’t, aren’t allowed
D．can’t, aren’t supposed
-May we leave the classroom now?
-No, you ______. You ______ to leave until the bell rings.
-No, you ______. You ______ to leave until the bell rings.
| A．mustn’t, are allowed | B．don’t have to, are supposed |
| C．needn’t, aren’t allowed | D．can’t, aren’t supposed |
参考答案：