单项选择题

A computer can only do ________ you have instructed it to do.

A．how
B．after
C．what
D．when
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单项选择题
We had no food, so ________ without.
A．made
B．lived
C．went
D．spent
单项选择题
It is not difficult for a person to ________ a bad habit.
A．pick up
B．make up
C．turn up
D．keep up
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