问一个关于being的疑问 求NN

235. (25121-!-item-!-188;#058&001450) (GWD-9-Q1)
A mixture of poems and short fiction, Jean Toomer'sCane has been called one of the threebest novels ever written by Black Americans—the others being Richard Wright, author ofNative Son, and Ralph Ellison, author of Invisible Man
A. Black Americans—the others being Richard Wright, author of Native Son, and RalphEllison, author of Invisible Man
B. Black Americans—including Native Son by Richard Wright and Invisible Man by RalphEllison
C. a Black American—including Richard Wright, author of Native Son, and Ralph Ellison,author of Invisible Man
D. a Black American—the others being Richard Wright, author of Native Son, and RalphEllison, author of Invisible Man
E. a Black American—the others being Richard Wright's Native Son and Ralph Ellison'sInvisible Man

答案是E 可以理解。 独立主格结构，noun+being+noun，并且平行结构很完美。 但是有个问题就是去掉being也是对的吧？这个疑问来源与这道题，见下面
                                   230. (28772-!-item-!-188;#058&003200) (GWD-8-Q32)
At the annual stockholders meeting, investors heard a presentation on the numerouschallenges facing the company, including among them the threat from a rival’s multibillion-dollar patent-infringement suit and the declining sales for the company’s powerfulmicroprocessor chip.
A. including among them the threat from a rival’s multibillion-dollar patent-infringementsuit and the declining sales for
B. which includes the threat of a rival’s multibillion-dollar patent-infringement suit anddeclining sales of
C. included among these the threat from a rival’s multibillion-dollar patent-infringement suitas well as a decline in sales for
D. among them the threat of a rival’s multibillion-dollar patent-infringement suit and thedecline in sales of
E. among these the threat from a rival’s multibillion-dollar patent-infringement suit as wellas the decline in sales for

这个题选D，也没问题，但是这个题结构是相似的，都是肚里主格结构，为什么这里就不用being呢？
还是说GMAT在这种情况下，being有没有都不是硬伤？？？

谢谢嘿嘿，而且貌似还发现一个问题，一般情况下，如果你发现你把being去掉这个句子没有语法错误，那么这个being就必须去掉。 如果being去掉句子挂了，那这个being就是正确的。

求NN验证一下喽