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Only when I made it to the train station that I had left my ticket at home. [ ]

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Only when I made it to the train station that I had left my ticket at home. [ ]

Only when I made it to the train station ________ that I had left my ticket at home.

[]A.

have I realized

B.

did I realize

C.

had I realized

D.

would I realize

试题答案

答案:B