◎ 题干
I failed in the final examination last term and only then _____ the importance of studies.
[     ]
A. I realized
B. I had realized
C. had I realized
D. did I realize
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I failed in the final examination last term and only then _____ the importance of studies.[ ]A. I realized B. I had realized C. had I realized D. did I real…”主要考查了你对  【一般过去时】【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。