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

A.who

B.whom

C.of whom

D.whose

答案及解析： 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。)