From the dateson the gold coin we decided that it was made five hundred years ago.A. mark

问题补充：

From the dateson the gold coin, we decided that it was made five hundred years ago.

A. marking

B. marked

C. to be marked

D. having been marked

答案：

A. marking

(答案→)B. marked

C. to be marked

D. having been marked

解析：本题是定语从句的省略。可以将原句恢复成“From the dates（which were） marked on the gold coin’，这样就比较容易找出答案。