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 instruction ask that we ______ a red pen.
A．do not use
B．not use
C．use not
D．did not use
单项选择题
The central plan, ______ by the government, shows the amount of each goods produced by the various firms and shared among different households for consumption.
A．drawn on
B．drawn down
C．drawn up
D．drawn back
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