[求助]请教一道prep语法题

As the former chair of the planning board for 18 consecutive years and a board member for 28 years, Joan Philkill attended more than 400 meetings and reviewed more than 700 rezoning applications.

A.     As the former

B.      The former

C.      Former

D.     She was

E.      As the

答案是E，
  为什么要将former去掉呢？

谢谢各位G友的解答，
  小妹在此感激不尽。

希望有个大牛可以解答一下哦！！

为什么没有人回我呢？

各位在做题的时候，有碰到过这个题吗，抑或类似的？

转：

As the chair of the planning board for 18 consecutive years and a board member for 28 years, Joan Philkill attended more than 400 meetings and reviewed more than 700 rezoning applications.

Reason:
I assume that Joan Philkill did the things mentioned during the entire time that she was a member of the planning board, and not (just) when or because she was the former chair of the planning board.

Thanks!!

嗯嗯, 我明白了，谢谢喽！！