Only when the CIA Director David Petraeus was forced to resign ______that it’ s hard to keep our e-mails secret.

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问题 Only when the CIA Director David Petraeus was forced to resign ______that it’ s hard to keep our e-mails secret.

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

答案C

解析 only置于句首时,要用倒装句,助动词要放在主语前,所以C项正确。
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