Not until he had left his friend _______ how important friendship was for him.A.did he realizeB.he realizedC.had he realizedD.he had realized
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A解析试题分析： 1.当Not until位于句首时,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+...。故排除BD，realize发生在had left 之后，故用一般过去时。 ②Not until next week will the sports meet be held.直到下周才开运动会。考点：部分倒装。
点评：当Not until位于句首时,句子要倒装。即学即练： It ______ we had stayed together for a couple of weeks ______ I found we had a lot in mon.A. was until; when B. was until; that C. wasn’t until; when D. wasn’t until; that 选D