while vs as OG10 Q69

Although she had signed a pledge of
abstinence while being an adolescent，Frances Willard was 35 years old before she chose to become a
temperance activist．

(A)  while being an adolescent

(B)  while in adolescence

(C)  at the time of her being adolescent

(D)  as being in adolescence

(E)       
as an adolescent

查了longman，觉得这道题目应该这样理解

While: during the time that something is happening. Ex. She met Andy while working on a production of Carmen.

As: when someone was in a particular age group. Ex: As a young man, Eliot had studied art in Paris.

可以发现，As 在这里确实好，说明Fances在做那件事情的时候的particular age group. 而while的时间段更短，而且表示同时发生。所以OG的解释是A,B are unidomatic. C,D,错误比较明显。

希望大家指正。

很好的解释！

另外这里有更多讨论

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=65352&replyID=&skin=0