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
本題考查倒裝。首先由時(shí)間狀語(yǔ)then確定時(shí)態(tài)為一般過(guò)去時(shí)，而時(shí)間狀語(yǔ)由only引出放于句首，句子產(chǎn)生部分倒裝，即助動(dòng)詞提前到主語(yǔ)之前，其他成分保持位置不變。
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