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
A physical examination is a ______ to joining the army.
A．parliamentary
B．preliminary
C．elementary
D．complementary
单项选择题
It can be hard to live up to one's ______.
A．enjoyment
B．evaluation
C．appreciation
D．reputation
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