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    精英家教网 > 高中英语 > 题目详情
    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
    A

    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。
    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 common.
    A. was until; when B. was until; that C. wasn’t until; when D. wasn’t until; that
    选D 
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