Only after I had reached the airport______that I had forgotten to take my ticket with me.

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问题 Only after I had reached the airport______that I had forgotten to take my ticket with me.

选项 A、I realized
B、have I realized
C、did I realize
D、I had realized

答案C

解析 only+状语置于句首时,主句使用部分倒装结构,即将谓语部分的助动词置于主语之前。由从句中的过去完成时推知主句中应是一般过去时,故选C。
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