请教GWD9-Q41， 谢谢！

wangcaroline

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 for private 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

The answer is E. 为什么C 不对阿？1）请教instead的用法 2）答案E中other than 后面的“what it is"的“what"指代什么呢？后面已经是一个很完整的句子了阿。
没有找到讨论帖，谢谢大家指点！

aeoluseros

OA is C.

wangcaroline

谢谢阿，看来我下载的版本答案有错。

miller811

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

这里的that是否有修饰conversation的嫌疑呢？ 我因此排除了C    
求解～

miller811

顶

糊涂的小黑

THAT这里不是代词。。。

ANNYXU

答案是C， E太罗嗦了