Question

Ahead of me I saw a woman ______I thought was my aunt.

1. A.
   who
2. B.
   whom
3. C.
   of whom
4. D.
   whose

Answer 1

A
这是在定语从句中加进插入语的用法。
(1) This is the girl who I believe was the driver of that car.
(2) I picked up a man who I thought was honest.
= I picked up a man whom I thought to be honest.
(注意who与whom由于在定语从句中所处的地位不同, 而取不同的形式。)