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The students are forbidden,unless they have special passes,_

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The students are forbidden,unless they have special passes,_____after 11 p.m.
A.to stay out B.from staying out
C.staying out D.not to stay out
为什么不能选B或C?
The students are forbidden,unless they have special passes,_
A
unless they have special passes 是插入语,可以不看
句子的主干就是,the students are forbidden to do sth
学生们下午一点之后禁止外出,除非他们有特别通行证
再问: forbid sb. to do sth. /forbid sb. doing sth./forbid sb. from doing sth. 那么变为被动后为什么不能用be forbidden from doing 和be forbidden doing呢?
再答: 只有stop form doing 的结构 禁止某人做某事是forbid sb to do sth forbid sb to do 和forbid sb doing 的区别是 不定式表将来,表示禁止的那件事,还没做 动名词表伴随,或者是已经做好了的,比如forbid smoming禁止抽烟 然后这里是被动,就不赘述
再问: forbid sb. from doing 的结构应该是有的。