As is known to all, the financial crisis firstly broke out in the United States, the group of developed countries.
A. belonging to
B. belonged to
C. belongs to
D. is belonged to
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(答案→)A. belonging to
B. belonged to
C. belongs to
D. is belonged to
解析：考查非谓语动词。逻辑主语the United States与belong to之间为主动关系，故用现在分词作定语，选A。