单项选择题

At present the engineering services and expertise is ______.

A. concentrated at headquarters.
B. spread unevenly throughout 12 factories.
C. both at headquarters and in the company’s 12 factories.

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单项选择题

A．expand
B．to extend
C．expanded
D．extended

At present the engineering services and expertise is ______. 您的浏览器不支持 audio 元素。