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
What is the ______ in going by boat when the plane costs no more and is quicker
A．impression
B．meaning
C．comprehension
D．sense
单项选择题
Our interests seem to ______ at this point.
A．constrain
B．condense
C．conduct
D．converge
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