Not until the house _ t...

Not until ________ the house _________ that he had left the keys inside.

A. he left; realized he B. he left; did he realize

C. did he leave; had he realized D. he had left; did he realize

B 【解析】考查倒装和时态。句意：直到他离开房子，他才意识到他把钥匙忘在屋里了。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+…。“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，故选B。

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Not until ________ the house _________ t...