2. 外语
  3. In the service of knowledge, scientists also train the most skilled component of the work force ______ to the employers.

In the service of knowledge, scientists also train the most skilled component of the work force ______ to the employers.

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问题 In the service of knowledge, scientists also train the most skilled component of the work force ______ to the employers.
选项 A、in no cases
B、in a case
C、at no cost
D、at a cost
答案C
解析 依据句义有否定的意思；另外是“不惜任何代价”之意，不指“无论任何情况下”。
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