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
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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
单项选择题
President Bush's visit was planned to______30th anniversary of President Nixon's visit to Chin
A．A. depend onB. adhere toC. coincide withD. cling to
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