单项选择题

Rivers have been important to man ______.

A．since the last century
B．for a very long time
C．since a few years ago
D．since a few hundred years ago
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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
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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