Not until some students failed the exam __________how much time they had wast...

作者: tihaiku 人气: - 评论: 0
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,notuntil,no sooner…than,bynomeans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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