These coins were used for the next 2000 years,that is,from 221 BC until 1916.这里的句子成分看不懂

These coins were used for the next 2000 years,that is,from 221 BC until 1916.这里的句子成分看不懂

题目
These coins were used for the next 2000 years,that is,from 221 BC until 1916.这里的句子成分看不懂
these coins were used 就是主谓了 而that is 不是重到了吗?说是同位语又奇怪,而且that is又被两个逗号隔开
答案
举一反三
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