【求助】XDF蓝皮书上两道题

RoadtoAmerica

第一道是P258,69
Although she had signed a pledge of abstinence while being an adolescent, Frances Willard was 35 years od 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 dolescent
答案是E， B为什么不对？

naoyixue

while 是连词， 这样造成句子套句子，although 句子套while句子，累赘。 但是下面就变成了as，as可以做介词，所以相比没有B那么累赘。所以E