OG12-106 希望有牛牛解答，很简单的问题~

fiona1988325

106.Marconi's conception of the radio was as a substitute
for the telephone, a tool for private conversation:
instead, it is precisely the opposite, a tool for
communicating with a large, public audience.


(A)Marconi's conception of the radio was as a
substitute for the telephone, a tool for private
conversation; instead, it is

(B)Marconi conceived of the radio as a substitute
for the telephone, a tool for private
conversation, but which is

(C)Marconi conceived of the radio as a tool for
private conversation that could substitute for the
telephone; instead, it has become

(D)Marconi conceived of the radio to be a tool
forprivate conversation, a substitute for the
telephone, which has become

(E)Marconi conceived of the radio to be a
substitute for the telephone, a tool for private
conversation, other than what it is,
请问 OG12-106题，（B ）选项Marconi conceived of the radio as a subtitute for the telephone, a tool for private conversation, but which is……
在这里 which 可以指代 conversation么？ 就在在 A OF B所有格中，后面有个which到底是指代谁？
还有这里的which是指代telephone的话，为什么不能指代插入成为,即刚刚说的 a tool for private conversation呢？

这道题正确答案是C



谢谢牛牛~

fiona1988325

万能的CD,这是一个牛牛年初的帖子，希望对大家有用，
http://forum.chasedream.com/GMAT_SC/thread-441459-1-1.html?SearchText=which ，#last