一般說來, it 優先代替原題主詞 (right??)
以下2題例句 (only show 正確答案的句子)
GWD12-Q19
An executive who is heavily committed to a course of action is likely to miss or misinterpret signs of incipient trouble when they do appear,especially if "it" has worked well in the past.
>> 依句義 it should mean "a course of action",but as a rule, it should substitute for "an executive"
GWD11-Q10
Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone ;instead ,"it" has become precisely the opposite, a tool for communicating with a large,public audience.
>>it's unreasonable unless "it" means the radio, but the same, according the rule, "it" should for "Marconi"
Please kindly let me know if I misunderstood anything
thanks