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【单选题】

In the service of knowledge, scientists also train the most skilled component of the work force ______ to the employers.
A．in no cases

B．in a case
C．at no cost
D．at a cost
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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

12%的考友选择了B选项

87%的考友选择了C选项

1%的考友选择了D选项

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