题干
. -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
答案(点此获取答案解析）
D
的棱上到异面直线AB，C