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
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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
单项选择题
--What were you up to when she dropped in--I ______ for a while and ______ some reading.
A．was playing, was going to do
B．played, did
C．had played, was going to do
D．had played, did
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