As we all know, China is a developing country to the third world.
A. belongs
B. belong
C. belonging
D. belonged
网友回答
A. belongs
B. belong
(答案→)C. belonging
D. belonged
解析：考查非谓语动词。句子的谓语是is，不能再用动词原形，排除A、B；country与belong之间是主谓关系，应该用现在分词，作后置定语，相当于which belongs to...。故选C。