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?

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。

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