高中一道定语从句的题Theway(that或者inwhich或者不填)heexplainedthesentencetouswasnotdifficulttounderstand.这里面的inwhich不就相当于where吗?where是引导状语从句的啊,怎么解释这里既能用inwhic

　　高中一道定语从句的题

　　Theway(that或者inwhich或者不填)heexplainedthesentencetouswasnotdifficulttounderstand.这里面的inwhich不就相当于where吗?where是引导状语从句的啊,怎么解释这里既能用inwhich也能用that的“原理”?