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
The answer this question is known ________ us all.
A．to ;by
B．of; to
C．of; of
D．to; to
单项选择题
Look! The house's ________ fire. Let's get some help.
A．been caught
B．catching
C．caught
D．been catching
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