题目内容

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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