Only when the CIA Director David was forced to resignthat it's hard to keep ...

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问题 Only when the CIA Director David was forced to resignthat it's hard to keep our e-mail secret.

选项 A．we realized
B．realized we
C．did we realize
D．we did realize

答案C

解析考查倒装句。在以“only+状语”开头的句子中，句子要使用部分倒装，助动词要放在主语前。故选C。

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