______is known to us all is that China is a developing country belonging to the Third World.

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问题 ______is known to us all is that China is a developing country belonging to the Third World.

选项 A、As
B、It
C、What
D、That

答案C

解析本题考查主语从句的用法。分析句子结构可知，句中缺少主语从句的引导词，且从句部分缺主语。what引导主语从句，且在从句中可作主语、宾语或表语。因此此处C为正确选项。

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大学英语三级A级

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