题目内容
（请给出正确答案）
[主观题]
A．It is proved to be efficient in helping employers make decisions.B．All companies in
A．It is proved to be efficient in helping employers make decisions.
B．All companies in U. S. are monitoring their employees at work.
C．It is undoubtedly helpful to reward those who are helpful.
D．The practice can be run cheaply and efficiently by the employers.
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