OG 的语法题

入夜荷花

og T24
The first decision for most tentants living in a builiding undergoing [U]being converted to cooperative ownership is if to sign [/U]a no-buy pledge with the other tenants.
(a)being converted to cooperative ownership is if to sign
(b)being converted to cooperative ownership is whether they should be signing
(c)being converded to cooperative ownership is whether or not they sign
(d)conversion to cooperative ownership is if to sign
(e)conversion to cooperative ownership is whether to sign
IF肯定不能用，我在C和E之间犹豫，选了C，但答案是E。为什么呢？[em03]

tongxun

1、undergoing 已经是一个进行中的动词形式，两个动词是不 能连在一起的。（除个别的单词外）
2、whether or not 在GMAT中算罗嗦的表达形式。GMAT一般用whether

入夜荷花

对啊，谢谢！

makai

whether to do是gamt及其喜欢用的表达方式,多么简洁啊.

investdaily

Rules of GMAT by LZM suggest that options with "being" can be excluded at first glance. Is it still applicable?