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
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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
The Parkers bought a new house but ________ will need a lot of work before they can move in.
A．they
B．it
C．one
D．which
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