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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