From the dates on the gold coin, we know that it was made 500 years ago.
A. marking
B. marked
C. to mark
D. to be marked
网友回答
A. marking
(答案→)B. marked
C. to mark
D. to be marked
解析：考查非谓语动词。根据句子结构可知可知，marked 作dates的定语，意为标在金币上的日期，date跟mark之间是被动关系，所以选择B。Marking表示主动，to mark/to be marked表将要发生或者目的。
句意为从金币上标的日期可以看出，它是五百年前制成的。