单项选择题

There's a whole of bills waiting to be paid.

A．stock
B．stack
C．number
D．sequence
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单项选择题
Having finished their morning work, the clerks stood up behind their desks, ______ themselves.
A．expanding
B．stretching
C．prolonging
D．extending
单项选择题
Stephen gripped the ______ wheel hard as the car bounced up and down.
A．stirring
B．driving
C．steering
D．revolving
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