单项选择题

The policeman demanded that she ______her identity card.

A．show
B．showed
C．would show
D．had shown
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单项选择题
I regret ______that wonderful art exhibition last night.
A．not to see
B．not having seen
C．to not see
D．having not seen
单项选择题
It was only then ______how much trouble I had caused to him.
A．had I realized
B．I did realize
C．that I realized
D．did I realize
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