问题补充:
-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
答案:
A. mustn’t, are allowed
B. don’t have to, are supposed
C. needn’t, aren’t allowed
(答案→)D. can’t, aren’t supposed
解析:考察情态动词否定回答及allow和suppose用法. mustn’t,禁止don’t have to, 不必needn’t,不必can’t不能.be supposed to应该,被期望做某事,be allowed to do sth 被允许做某事.根据题意,我们现在可以离开房间了吗?——不,你们不能。你们铃响之前别想 离开。选D。