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单选题
Not until she arrived at the meeting room _____ she had forgotten to bring the document.
A
she realized
B
did she realize
C
she did realize
D
does she realize
参考答案
参考解析
解析：
句意：直到他到了自习室才意识到忘带文件了。倒装结构。not until“直到……才……”，放在句首时，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＋...，由于题干是过去式，在构成部分倒装结构时，要借助于助动词did，且需要置于主语she之前，因此B项为正确答案。AC两项不是倒装结构，D中虽然是倒装结构但是助动词使用错误，时态不对。所以这三项均可以排除。
句意：直到他到了自习室才意识到忘带文件了。倒装结构。not until“直到……才……”，放在句首时，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＋...，由于题干是过去式，在构成部分倒装结构时，要借助于助动词did，且需要置于主语she之前，因此B项为正确答案。AC两项不是倒装结构，D中虽然是倒装结构但是助动词使用错误，时态不对。所以这三项均可以排除。
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