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
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