【题目】Only then _______________ that I had made a terrible mistake.
A. I realized B. did I realize
C. I had realized D. had I realized
在线课程【答案】B
【解析】考查部分倒装。only加状语位于句子开头，句子用部分倒装。根据then可知主句用一般过去时态，故选B。
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