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
President Bush's visit was planned to （） 30th anniversary of President Nixon's visit to Chin

A．A. depend on
B. adhere to
C. coincide with
D. cling to
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