请教i-94上为何说admission cannot be authorized

本人刚用AP从加拿大回到美国,但是新的I-94上面说
Your admission cannot be authorized at this time, You are PAROLED
until Dec 14, 2008
Conditions:
DA Pending AOS
能否解释一下,为什么说admission cannot be authorized
这是我第二次用AP,AP还有一个月到期

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