Only then ______ that it had been a trick.
A、
he realized
B、
he understood
C、
did he realize
D、
he did realize
【正确答案】
C
【答案解析】
副词Only置于句首，句子主谓应进行倒装；谓语动词若为实意动词，应借助于助动词，并将助动词置于主语前。
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