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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Do you have any clothes to ______ , Tom mother asked.
A．wash
B．be washed
C．washing
D．washed
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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