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?

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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?
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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\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\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

因为强调 only then, 所以后面的句子里的 主语 I 和 谓语 realized 要倒置,就成了 did I realize

要到装的 only then

D
倒装

only then 出现要用倒装