◎ 题干
Only when he started to explain        the reason for this.    
[     ]
A. she realized  
B. did she realize  
C. she had realized    
D. had she realized
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Only when he started to explainthe reason for this.[ ]A. she realized B. did she realize C. she had realizedD. had she realized…”主要考查了你对  【部分倒装】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。