单项选择题

For workers in small firms employment ________ are very rare, working hours are longer and safety records poor.

A．guarantees
B．reservations
C．securities
D．assumptions
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单项选择题
Am I to understand that his new post ________ no responsibility with it at all
A．keeps
B．supports
C．carries
D．possesses
单项选择题
One of the distinguishing ________ of modern banking is its dependence on computers.
A．features
B．virtues
C．marks
D．images
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