No one ______this building without the permission of the police.A is leaving B is to leave C has left D will be leaving.选哪个,为什么?

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No one ______this building without the permission of the police.A is leaving B is to leave C has left D will be leaving.选哪个,为什么?

No one ______this building without the permission of the police.A is leaving B is to leave C has left D will be leaving.选哪个,为什么?
No one ______this building without the permission of the police.
A is leaving B is to leave C has left D will be leaving.选哪个,为什么?

No one ______this building without the permission of the police.A is leaving B is to leave C has left D will be leaving.选哪个,为什么?
B
is to do表示将来 却有义务责任的含义