A research center has been set up in this country.

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问题 A research center has been set up in this country.

选项 A、praised
B、established
C、reformed
D、criticized

答案B

解析 句意为:这个国家已经成立了研究中心。set up“成立,建立”,四个选项:praise“表扬”;establish“建立”;reform“改革,改造”;criticize“批评,指责”。
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