in which是带介词的 关系代词 引导定语从句 修饰a fax并作定语从句中的状语 在定从中的意思 也就是in the fax
which引导的定语从句,which 在句中代指fax,editor 是在fax中的,所以有个从属关系,这里用介词in表示从属关系,he informed the editor in the fax
in the fax,一般是紧跟着的那个名词。顺过来就是 He had at last been allowed to send a fax. In the fax he informed the editor that he had been...
问题1,in which 引导一个定语从句,来说明传真的内容,因为内容是in the fax的,所以要用in which。 问题2,he had at last been allowed to send a fax是句子主干,in which 是定性定于从句修饰fax;which surrounded the president's palace...