OG122题

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OG122

Chinese, the most ancient of living writing systems, consists of tens of thousands of ideographic characters, each character a miniature calligraphic composition inside its own square frame。

请问正确答案A里的character是不是动词，each character a miniature calligraphic composition inside its own square frame在句中作什么成份。

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each character( a miniature calligraphic composition inside its) own square frame括号中是补语，character是名词：字符。