Not until,the house_that he had left the keys inside

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Not until____,the house_____that he had left the keys inside.
A.he left;did he realize B.he had left;did he realize 为什么选A不选B?离开家不是发生在“意识到钥匙在家里”之前吗?不是应该用过去完成时吗?

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Not until____,the house_____that he had left the keys inside.
A.he left;did he realize B.he had left;did he realize
【答案】A
Not until 在句首,句子要倒装.其结构为:Not until+从句/表时间的词+助动词+(主句)主语+谓语+..
在AB选项中,第二个空都已用倒装.只需要区分第一个空格.
根据句意：【直到他离开了房间,他才发现自己把钥匙落在了屋里.】
可知,“离开房间”和“发现”两个动作是并列且过去同时发生的,所以都用一般过去时态,而“钥匙落在屋里”要发生在这两个动作前,是过去的过去,所以用过去完成时态.

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