问题
选择题
—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
答案
答案：D
题目分析：句意：现在我们能离开教室了吗?不,不能. 直道铃响你才能离开. don’t have to不必; mustn’t禁止,不许可; needn’t不必, can’t不能.第二个空考察的是not…until的用法。结合句意，故选D