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问题: 高一英语选择题,请说明选与不选的原因,谢谢!

______ is known to us all is that China is a developing country ____ the Third World.

A.As; belong to
B. It; belongs to
C. What; belonging to
D. That; belonging to

解答:

C
what is known to us all主语从句

that China is a developing country ____ the Third World. 表语从句.
belonging to the Third World 现在分词做定语.