she thought i was talking about her daughter,(while)in fact,i was talking about my daughter

题目

she thought i was talking about her daughter,(while)in fact,i was talking about my daughter
为什么不选whom,理解为实际上我谈论的人是

答案

这里是插入语而不是定语从句
后一句i was talking about my daughter是一个完整的句子
while whoever whatever 等均表转折
这里根据意思填while相当于but是连词
而且如果填whom就修饰her daughter 很显然后面那个句子不是的
而in fact又不能作为定语从句的完整部分只是一个表状态的副词短语