That is the man I told you about the man.变定语从句是不是That is the man who I told you about .还有一道He is the man.The man offered you a job in Australia.变定语从句是不是He is the man who offered you a job in Australia .对不？

定语从句关系代词有：who, whom, whose, that, which
关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分
首先，这句话的主句是——I told you about the man。
这句话的从句——（which man？）That is the man
所以不难看出，the man，在主句中是宾语成分。
我们想想定语从句中关系代词作宾语的有什么？？
当然whom/that在从句中作宾语，而who/that做的是主语.
知道答案了么,应该是 whom/ that

That is the man who I told you about.这里面的who还可以用whom（宾语）替换，最好用whom，尽管who可以替换whom
此句话还可以把介词提前，此时必须用whom，如下：
That is the man about whom I told you.

是的.
不明白的再问哟,请及时采纳,多谢!