单项选择题

He didn't go to the party. Now he regrets ______ so.

A．have not done
B．not having done
C．not doing
D．do not do
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单项选择题
He might do it, and so ______.
A．might his best friend
B．his best friend may
C．will his best friend
D．his best friend should
单项选择题
He's ______ that nobody likes him.
A．so stubborn man
B．such stubborn man
C．so stubborn a man
D．such stubborn a man
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