is known to all, China is a developing country, belonging to the third world.A. It B. That C. As D.

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【题目】___ is known to all, China is a developing country, belonging to the third world.

A. It B. That C. As D. Which

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【答案】：C

【解析】：

试题分析：划横线所在的句子缺少一个主语，且根据后面的长句来看，这个空也要起到连词的功能，只有C项满足。句意：正如我们所知的，中国是一个发展中国家，属于第三世界。