15 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.

The answer is A, and the question is about "agreement", while I'm not clear with the structure of the sentence. 我觉得划线中的“each character “ 中的character 应该是个动词吧，那样的话不是应该用characters以达到主谓一致吗？非常confuse啊，期待nn给解答一下我的傻问题，脸红退下~~

谢谢楼上的nn，明白了，独立主格是我的盲点呐！

向nn学习，敬礼！

gg看一下白勇语法讲解的独立主格结构就明白了

考得最多就是with  and each

句子+复数名词结尾，each+介词短语/形容词短语/-ed形式/-ing形式