Onlywhenhestartedtoexplain______the

发布时间：2020-07-26 18:50:47

Only when he started to explain______the reason for this.A.she realizedB.did she realizeC.she had realizedD.had she realized

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B解析副词only (+ 副词/副词短语/副词从句)放在句首, 句子形成倒装 [Only + 副词(副词短语/副词从句) + 助动词(or be) + 主语]
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