题目内容
23、I failed in the job interview last week and only then_________ the importance of English.
A.I realized B.I had realized C. had I realized D. did I realize
试题答案
23、D
解析：only引导的倒装句的结构是：only+副词/介词短语/状语从句 +助动词+句子剩余部分。注意倒装是把助动词提前，而不是把整个谓语提前。同时考虑题的时态和语态。
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