英语三级B级
A．I realized
B．have I realized
C．did I realize
D．I had realized
【考点】倒装结构
【解析】0nly+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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