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I failed in the spoken examination last term and only then _______ the importance of practicing speaking English.
A.I had realizedB.had I realizedC.I did realizeD.did I realize
D
本题考查倒装。首先由时间状语then确定时态为一般过去时,而时间状语由only引出放于句首,句子产生部分倒装,即助动词提前到主语之前,其他成分保持位置不变。
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