Only then ______ the importance of education.A、I understandB、did I understandC

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问题 Only then ______ the importance of education.

选项 A、I understand
B、did I understand
C、did I understood
D、do I understand

答案 B

解析倒装。当only+状语，not until，only when等或not until+时间状语置于句首时，引起部分倒装。此处应把助动词did置于主语I之前，即：did+主语 +动词原形。

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