Question

Ahead of me I saw a woman ____I thought was my aunt． A who B whom C of whom D whose

为什么选A不选C

Answer 1

who was my aunt是定语从句，先行词a woman,定语从句缺少主语，故要用who，不能用whom。
I thought 只是插入语，删除它不影响句子的结构，是干扰你的。

1、先行词指人时，引导词可用Who,Whom,及that,其中当引导词在句中作主语时用Who或that；当其充当宾语时用whom或that，在非正式宾语中也可用who，也可省略。
a That boy who/that broke the window is called Tom.
b The person to whom you just talked is Mr Li.
b 句可改为：The person(that/whom/who)you just talked to is Mr Li.

2、先行词指物时，引导词用that或which
a.They planted the trees which didn’t need much water.
b .The fish (which)we bought were not fresh.