题目内容
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 |
B
解析考查倒装句。only +状语放在句首时使用部分倒装，助动词前提，题中only 加的是时间状语，然后根据时态，可判断出选B。
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