单项选择题

New data has______that the damage to the ozone layer is not confined to the southern hemisphere.

A．ratified
B．confirmed
C．assured
D．approved
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单项选择题
The problem has been______my mind all day.
A．preying on
B．getting at
C．taking on
D．seeing to
单项选择题
The man went to prison, but the two boys______with a warning.
A．took off
B．got off
C．kept off
D．set off
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