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
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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
单项选择题
George preferred working to ______ leisurely at home.
A．be sitting
B．to sit
C．sitting
D．have sat
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