英语四级完型填空解析the agent was not known until a doctor found it by

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英语四级完型填空解析
the agent was not known until a doctor found it by chance和Until she spoke I hadn't realized she was foreign都是until,为什么一个用过去时一个用过去完成时

不能用固定思维去考虑问题,只能说明英语的不固定性.学英语最重要的是语感,两种都对啊,貌似not...until没有固定时态吧
第一句里那个agent被发现是瞬间的事,不能一直被发现.第二句里呢,我知道她是外国人,是持续不变的事,不可能现在知道,过一会就不知道了,对吧.

英语四级完型填空解析the agent was not known until a doctor found it by It was not until midnight that the children were found not i 把这句话译成中文It was not until three hours later that a doctor cam It was not until dark( )he found( )he believedwas the correc It was not until dark( )he found that he worked out the last 1.It was not until dark ___ he found ____ he considered the It was not until they got stuck in the mud _____ they found 语法填空John vSnow was a well-known doctor in London in the 19th 英语语法：It was not until dark that he found 请问是it was not until 1990s还是It was not until the 1990s it was not until dark__she found__she thought was the correc It was not until last week__she found-_she thought was quite