单项选择题

The father went to the door in _____ to a knock from outside.

A．answer
B．difficulty
C．regard
D．case
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单项选择题
Some economists attribute much of the rising wage inequality in this country ______ the shift in favor of the most skilled workers.
A．in
B．on
C．by
D．to
单项选择题
The trouble is that he really likes doing it but he's _____ to admit it.
A．shameful
B．shamed
C．ashamed
D．shaming
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