单项选择题

Only after I had reached the airport ______ that I had forgotten to take my ticket with me.

A. I realized

B. have I realized
C. did I realize

D. I had realized
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单项选择题
A. She’s my friend. B. She had lunch. C. She passed the entrance exam. D. She is a pretty girl.
A. She’s my friend. B. She had lunch.
C. She passed the entrance exam. D. She is a pretty girl.
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