Prep1-159 百思不得其解 求助

159.      (33521-!-item-!-188;#058&006923)

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

为什么不能说 As the former chair....?

想请问MM是PREP破解的语法笔记吗？ 哪里可以下载。

谢谢。