问题补充：
DuoDuo is a great lone traveler crossing borders of nation, language and history, as well as a determined predictor of some of the most basic, universal human values that in our troubled modern times.
A. have been overlooked
B. have overlooked
C. has been overlooked
D. is overlooked
答案：
(答案→)A. have been overlooked
B. have overlooked
C. has been overlooked
D. is overlooked
解析：that引导定语从句，先行词为values，意为在一团混乱的现代社会中所被忽视的价值观。
