单项选择题

"Key" time is a period when ______.

A．visitors come to the plants
B．all workers must be at work
C．employers go round in the workshops
D．rush hours are over
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单项选择题
One of the main advantages of Flextime for workers is that they ______.
A．have a greater sense of duty
B．can avoid busy traffic
C．can get higher pay
D．can avoid working hard
单项选择题
Flexible working hours were firstly used by the ______.
A．British
B．Americans
C．Germans
D．Japanese
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