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.


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

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

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

Marconi conceived of the radio to be a tool for private conversation, a substitute for the telephone, which has become

Marconi conceived of the radio to be a substitute for the telephone, a tool for private conversation, other than what it is,

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题目分析：
本题的难度在于有些选项的考点隐藏的较深，较难以排除。

选项分析：

A选项：本选项是一个系表结构，as a substitute for the telephone是Marconi’s conception of the radio的表语。在语法上，表语也称为主语的补语，在解释说明主语。因此，本选项的意思是：“M对于收音机的概念”是“电话的替代品”。但是，在逻辑上这是不正确的。因为，真正“是”电话的替代品的应该是“收音机”，而不是某人对收音机的概念，即，应该写为：
Marconi conceived of the radio as a tool for private conversation. 
此时，as a tool for private conversation做宾语的补语，其表示the radio和a tool for private conversation之间是“是”的关系，这是因为，例如：
I put the book on the table.
划线部分也是宾语（the book）的补足语。观察例句可知，宾语the book和补语on the table之间是“是”的关系，即，the book is on the table。例句表示，我“令”书具有在桌子上这一状态。

B选项：but是一个连词，必须连接两个句子（有时因为省略而看似只连接了两个功能相同的成分（详见功能平行））。本选项中but后是一个定语从句，由于该从句前没有平行的对象，所以在语法上不正确。

C选项：Correct. 本选项在语法和逻辑上均是正确的。

D选项：which has become precisely the opposite是定语从句，就近修饰名词the telephone。但这在逻辑上是不对的。因为真正变成相反的东西的应该是“收音机”。另外，不定式短语to be a tool for private conversation应改为介词短语as a tool for private conversation。这点考查了不定式和名词的区别。用之于本题，由于conceive的约束力较弱（as／to be a tool是宾语的补足语），所以身后应用名词（介词短语）。

E选项：other than what it is不是连词，不能连接两个句子。other than = except，是“除了…以外”的意思，而且是介词短语，other than应改为rather than，且rather than可做介词亦可做连词，意思为“而不是…”。

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