Only when I made it to the train station _______ that I had left my ticket at home.
A．have I realizedB．did I realizeC．had I realizedD．would I realize
B
考查倒裝句。Only +狀語放在句首，使用部分倒裝。從句不倒裝，主句倒裝。此題是Only+時間狀語放在句首，根據(jù)時態(tài)應選B。
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