I failed in the final examination last term and only then __

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I failed in the final examination last term and only then __ the importance of studies.
A.I realized\x05B.I had realized\x05C.had I realized D.did I realize
为什么不能选A呢?

I failed in the final examination last term and only then __ the importance of studies.
A.I realized\x09B.I had realized\x09C.had I realized D.did I realize
选D
这是一句only引导的状语从句放句首引起的部分倒装
结构是
only+状语从句+助动词+主语+谓语（动词）+宾语
所以选D

I failed in the final examination last term and only then __ i failed in the examination last term and only___the importa I failed in the job interview and only then _____ the import jim isn't __,but he did badly in the final exams last term,w he failed in the examination , He studied very hard ,but he failed in the final examination The final examination will cover all__taught this term. The final examination will cover all__taught this term I failed in the find exam last termand only then_--- the imp 英语阅读解析!It was the last day of the final examination in a lar It was the last day of the final examination in a large east i am cramming for the final examination