Only then ____ that he had left his key

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问题 Only then ____ that he had left his key on his office.（　　）A． he realized B． did he realize C． had he realized D． he had realized

选项 A． he realized
B． did he realize
C． had he realized
D． he had realized

答案 B

解析 “only+状语从句”位于句首，句子发生部分倒装，即把助动词放在主语前面。then表示在过去，故用did。

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