I failed in the final examination last term and only then ________ the importance of studies.
A．I realizedB．I had realized
C．had I realizedD．did I realize
D

試題分析：考查only的倒裝句：only+狀語（介詞短語，副詞，狀語從句）后面的主句要部分倒裝，這句話only then是時間狀語，后面的句子倒裝，因為是同時發(fā)生，所以是過去時，did提到主語前面，句意：期末考試我不及格，只有那時我才知道學習多么的重要。選D。
點評：Only放在句首，強調(diào)狀語的時候，后面使用倒裝句的語序。但注意如果only后面接的是主語或賓語，就不用倒裝句。
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