—How was your journey last week?
—Very interesting. The people there still keep the custom the Ming Dynasty, which is different from other areas.
A. dating back to
B. dating back
C. dated back to
D. dated back
网友回答
(答案→)A. dating back to
B. dating back
C. dated back to
D. dated back
解析：keep sth. doing sth. 意为“使某事一直处于某种状态”。date back to意为“追溯到”，是固定用法。