单项选择题

Some economists attribute much of the rising wage inequlity in this country _______ the shift in favor of the most skilled workers.

A．in
B．on
C．by
D．to
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单项选择题
The trouble is he really likes doing it but he’s _______ to admit it.
A．shameful
B．shamed
C．ashamed
D．shaming
单项选择题
It takes only half an hour to go to the museumby a short _______ across the park.
A．reach
B．cut
C．sharp
D．flash
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