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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单项选择题
George preferred working to ______ leisurely at home.
A．be sitting
B．to sit
C．sitting
D．have sat
单项选择题
Was it during the Second World War ______ he died
A．which
B．that
C．as
D．then
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