单项选择题

60% of the population of the town ________ workers; things are different now.

A．is
B．are
C．was
D．were
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单项选择题
The Parkers bought a new house but ________ will need a lot of work before they can move in.
A．they
B．it
C．one
D．which
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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