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
He found it necessary for us ______ from each other.
A．to help and learn
B．helping and learning
C．to learn and help
D．learning and helping
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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