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

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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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A——taximeterB——requeststopC——cabdriverD——wholebookoftickets