Not until some students failed the exam______how much time they had wasted.

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问题 Not until some students failed the exam______how much time they had wasted.

选项 A、they realized
B、did they realize
C、didn’ t they realize
D、they didn’ t realize

答案B

解析考查倒装。在以never，little，hardly，scarcely，not only，not until，no sooner…than，by no means等开头的句子中，主谓要倒装，排除A、D两项。这些词或词组本身已经表示否定或半否定意义，所以谓语动词借助肯定助动词即可。故选B。

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