我觉得是选d.
原因：leave不是持续性的动作,不能用进行时,所以a b不对.
d用的是be to do结构,一般说来,这个结构表示两种语法结构,
一种是be +动词不定式,不定式做表语,表示主语和表语在概念上是等同的.
另一种是情态用语,表示“计划”,“打算”,“应该”,“义务”等等吧.建议你去查查它的用法.
No one__this building without the permission of the police.
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