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
Flexible working hours were firstly used by the ______.
A．British
B．Americans
C．Germans
D．Japanese
单项选择题
No matter where it is used, Flextime system has proved ______.
A．entirely effective
B．a complete failure
C．to be disliked by the employers
D．too difficult to carry out
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