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
I don't know whether you happen ______ , but I'm going to study in the U.S.A. this September.
A．to be heard
B．to be hearing
C．to hear
D．to have heard
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