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   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）

(E) as an adolescent

请问这里B为什么不能选呢?while作为连词的用法在gmat里有什么规定呢?

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