问题补充：
, I have never seen anyone who’s as wise as John.
A. As long as I have traveled
B. Now that I have traveled so much
C. .As I have traveled so much
D. Much as I have traveled
答案：
A. As long as I have traveled
B. Now that I have traveled so much
C. .As I have traveled so much
(答案→)D. Much as I have traveled
解析：句意：虽然我旅行过这么多地方，但是我从没有看过象约翰这样聪明的人。因为是转折关系，所以使用倒装句“名词/动词/形容词/副词+as/though+主谓”这个结构，所以选D。
