求助PREP2 171

TheGreek

171. (GWD-10-Q2) (GWD-11-10)
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,
答案是C 那这里的a tool for private conversation到底是修饰radio还是telephone呢？
分析里说是修饰radio可感觉句义上说不通啊
于是求解释…………多谢了TVT

shell6688

a tool for private conversation 是修饰radio的， 而conceive of sth as sth 可算是个搭配，这里是说，M认为radio 可作为代替 telephone的一个private conversation的工具，而事实上并不这样blablabla...

Amy1989618

请问LS是说，that 跨过 as a tool for private conversation指代 radio么？
另外，分号以后的 it 指代什么？
最后的 a tool for communicating with a large 是什么成分？
结尾的 逗号+public audience 是什么结构？？？