China is a_________country while the United States is________one.填什麽?如何填?

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China is a_________country while the United States is________one.填什麽?如何填?
China is a_________country while the United States is________one.填什麽?
如何填?

China is a_________country while the United States is________one.填什麽?如何填?
developing 发展中 developed发达的