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
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单项选择题
I first met Lisa three years ago when we ______ at a radio station together.
A．have worked
B．had been working
C．were working
D．had worked
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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