She thought I was talking about her daughter ,__________,in face,I was talking about my daughter

题目

She thought I was talking about her daughter ,__________,in face,I was talking about my daughter
A whom b where c which d while
and tell me why 3x

答案

d while
a b 明显不对,可以排除.
通过对句子大意了解,存在转折关系,用 while.
同时,which 引导从句,好像要和从句相连,中间不能用逗号分开.