单项选择题

The office staff ______ gathered to hear the manager speak.

A．have
B．is being
C．has
D．is
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单项选择题
We advised them to take a rest, but they ______ on finishing the work.
A．suggested
B．continued
C．insisted
D．persisted
单项选择题
The older worker and the young each ______ their own tools.
A．have
B．has
C．are having
D．is having
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